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For 2004–2008 Acura TL owners, the TruHart StreetPlus coilover kit sold by Undergrounddynamics is the practical pick: model-specific fitment for the UA6/UA7 chassis, tuneable damping and ride-height adjustment, and full spec documentation so you know exactly what you’re bolting on. No guesswork, no adapting a “close enough” kit.
Here’s what makes it the go-to for this generation:
- Chassis-specific fit for all 2004–2008 Acura TL trims (UA6/UA7), including the Type-S
- Adjustable damping and ride height so you can dial in daily comfort or sharpen up for track days
- Full spec sheet and installation guide published by Undergrounddynamics for confident purchasing
- Rebuildable construction with warranty coverage against manufacturing defects
Table of Contents
- What are the specs on the Acura TL coilovers from Undergrounddynamics?
- What configurations and pricing options are available?
- Does this kit fit your specific year and trim?
- How do you install these, and what does long-term ownership look like?
- How do these coilovers change the way your TL drives?
- What do owners say, and what does the warranty cover?
- Who should buy these, and what should you check first?
- Ready to order your Acura TL coilover kit?
- Key Takeaways
- Why model-specific fitment matters more than you think
- Useful sources and further reading
- FAQ
What are the specs on the Acura TL coilovers from Undergrounddynamics?
The TruHart StreetPlus kit is built around a true coilover design front and rear, with independent ride-height adjustment that doesn’t require compressing the spring to change height. That matters because it preserves maximum damper travel at your chosen drop, which is exactly where budget kits cut corners.
| Spec | Front | Rear |
|---|---|---|
| Suspension design | True coilover | True coilover |
| Damping adjustability | 32-way | 32-way |
| Height adjustment | Independent of spring preload | Independent of spring preload |
| Top mounts | Aluminum with rubber bushings | Aluminum with rubber bushings |
| Camber plates | Optional pillowball upgrade | N/A |
| Shock body finish | Anodized / corrosion-resistant | Anodized / corrosion-resistant |
Key construction details worth knowing:
- Monotube shock design increases oil capacity and heat dissipation compared to twin-tube setups, which matters on longer spirited drives
- multiple-step simultaneous compression/rebound adjustment — one knob changes both at once, which keeps setup simple without sacrificing tunability for most street and occasional track use
- Rebuildable internals mean you’re not throwing the whole kit away if a seal goes
- Corrosion-resistant shock body handles road salt and wet conditions without pitting
The spec that separates a functional kit from a stance kit is independent height adjustment. When height is adjusted by moving the spring perch rather than the lower bracket, you’re trading damper travel for drop. The TruHart design avoids that trade-off, giving you lowered stance without bottoming out on every pothole.
Pro Tip: Before ordering, pull your VIN and confirm UA6 (FWD) or UA7 (AWD) designation. The chassis code determines top-mount geometry, and getting it wrong means a return trip.
Undergrounddynamics publishes a step-by-step suspension guide alongside the product page, so you’re not hunting for install info on a forum at midnight.
What configurations and pricing options are available?
The TruHart StreetPlus kit is positioned as a street-plus setup: stiffer than OEM for real handling improvement, but not so aggressive that daily driving becomes punishment. It’s the sweet spot for TL owners who want the car to feel planted without rattling their fillings loose on the highway.
Configuration options at a glance:
- Street setup: Softer spring rates, damping set in the lower third of the range, drop of roughly one to one and a half inches. Comfortable enough for daily use with noticeably reduced body roll.
- Street-plus / spirited: Mid-range damping (around 16–20 clicks from full soft), drop between one and two inches. The default recommendation for most buyers.
- Track-oriented: Damping near full stiff, drop kept conservative (around one to one and a half inches) to preserve travel. Pair with alignment and sway bar upgrades for best results.
Pricing for the kit sits within the mid-market range for model-specific coilovers. Undergrounddynamics lists current pricing on the suspension category page, where you can also check for any active promotions or bundle options. Financing options may be available at checkout depending on your payment method.
Warranty: The kit carries a manufacturer warranty against defects in materials and workmanship. Rebuildable construction means that even after warranty, you’re not stuck buying a full replacement kit for a single failed component.
Pro Tip: If you’re on the fence between street and street-plus spring rates, go street-plus. You can always soften the damping clicks; you can’t change the spring rate without swapping springs.
Does this kit fit your specific year and trim?
The kit fits all 2004–2008 Acura TL models on the UA6 (FWD) and UA7 (AWD) chassis. That covers the base TL and the Type-S across all model years in that generation.
What’s included in the box:
- 4 complete damper/spring assemblies (2 front, 2 rear)
- Adjustment collars and locking rings
- Top mounts (front and rear)
- All mounting hardware and fasteners
- Installation instructions
Compatibility notes to check before you install:
- Type-S: Fits, but verify spring-rate preference. The Type-S has a slightly stiffer OEM setup; some owners prefer a higher spring rate to match the car’s original character.
- Camber plates: Front camber plates are available as an optional upgrade (pillowball top mounts). If you’re dropping more than 1.5 inches, spring rates and camber plate availability are the two most common decision points flagged by TL owners. Add them.
- Wheel clearance: At 2+ inches of drop, check inner fender clearance with your specific wheel offset. Stock wheels are generally fine; wider aftermarket wheels may rub.
- Sway bar endlinks: At lowered ride height, OEM endlinks often bind. Budget for adjustable endlinks as part of the install.
Pro Tip: Measure your current ride height at all four corners before you pull the OEM suspension. That baseline makes post-install height matching much easier and helps you avoid an uneven stance.
| Year | Trim | Chassis | Fits? |
|---|---|---|---|
| 2004–2008 | TL (base) | UA6 (FWD) | Yes |
| 2004–2008 | TL Type-S | UA6 (FWD) | Yes |
| 2004–2008 | TL AWD | UA7 (AWD) | Yes |
| 2009–2014 | TL | UA8/UA9 | No — different kit |
How do you install these, and what does long-term ownership look like?
A competent DIYer with a spring compressor, torque wrench, and floor jack can complete the swap in roughly 4–6 hours. A shop will typically knock it out in 2–3 hours. Professional installation on a 2004–2008 TL runs approximately $700–$1,300 depending on your market; DIY parts cost typically falls within a range generally seen for kit pricing.
Tools you’ll need:
- Floor jack and jack stands (minimum 2-ton rating)
- Spring compressor (rent one — don’t skip this)
- Torque wrench (0–150 ft-lbs range)
- 17mm, 19mm, and 22mm sockets
- Penetrating oil for corroded OEM hardware
Maintenance schedule:
- Every 12 months or 15,000 miles: Check collars and locking rings for loosening; re-torque if needed
- Every 2 years: Inspect seals and bushings for wear or cracking
- Every 3–4 years (or after track use): Consider a rebuild if damping feel has softened noticeably
Excessive lowering is the fastest way to kill a coilover kit. Dropping below recommended ride height reduces effective damper travel, which increases peak piston velocity on the same bump event and accelerates internal wear. Stay within the kit’s recommended drop range.
Pro Tip: After install, drive 50–100 miles before your alignment appointment. Suspension components need to settle before an alignment reading is accurate.
How do these coilovers change the way your TL drives?
Coilovers are the most effective single upgrade for reducing understeer and tightening cornering on the 2004–2008 TL, especially when paired with upgraded sway bars. The OEM setup prioritizes comfort; a coilover kit with higher spring rates and adjustable damping shifts that balance toward control.
| Setup | Ride height drop | Damping setting | Best for |
|---|---|---|---|
| Daily comfort | 1–1.5 in | 6 clicks from soft | Commuting, long highway miles |
| Spirited street | 1.5–2 in | 16–20 clicks from soft | Canyon runs, weekend drives |
| Track day | 1–1.5 in | — | Autocross, HPDE events |
The tradeoff is real: stiffer spring rates reduce body roll but transmit more road texture into the cabin. On a smooth highway, you won’t notice much. On a rough urban commute, you’ll feel every expansion joint. Most TL owners running the street-plus configuration report a comfortable daily experience with a noticeably sharper response in corners.
Keep drop conservative for track use. A slammed TL looks clean in a parking lot but runs out of travel on a track, which causes the suspension to bottom and the car to push wide in corners.
Pro Tip: Make damping adjustments in 5-click increments and drive at least 20 miles between changes. Smaller steps let you identify the exact setting where the car feels right rather than overshooting.
What do owners say, and what does the warranty cover?
The warranty covers manufacturing defects in materials and workmanship. Rebuildable construction means individual components (seals, springs, cartridges) can be replaced rather than requiring a full kit swap. For warranty claims or RMA requests, contact Undergrounddynamics directly through the product page.
“The spec that builds buyer confidence isn’t the marketing headline — it’s the click count, the spring rate, and whether the kit is rebuildable.” Buyers who can verify those three numbers before purchase report significantly fewer post-install surprises, according to consistent feedback across TL owner communities.
Owner feedback trends for model-specific coilover kits on the UA6/UA7 chassis consistently highlight:
- Durability: Kits with monotube construction and corrosion-resistant bodies hold up well in northern climates with road salt exposure
- Noise: Rubber top mounts reduce the clunking common with pillowball mounts on daily drivers; pillowball upgrades are worth it only if you’re tracking the car regularly
- Ride quality: Most owners report the street-plus setup as the best balance for mixed use
Undergrounddynamics publishes product photos and spec sheets on the product page, which reduces the “what am I actually getting” uncertainty that plagues generic listings.
Who should buy these, and what should you check first?
This kit makes sense if you’re a 2004–2008 TL owner who wants real handling improvement with the flexibility to adjust for daily driving or occasional track use. It’s not the right call if your goal is an extreme slammed stance with 3+ inches of drop — that level of drop sacrifices too much travel for street use.
Before you buy, answer these:
- What’s your primary use? Daily, spirited street, or track?
- How much drop do you actually want? (1–2 inches is functional; beyond that, trade-offs multiply fast.)
- Do you have a budget for alignment after install? (Non-negotiable — skip it and you’ll eat tires.)
- Are you running stock wheels, or do you need to check clearance for wider offsets?
- Do you want camber plates? If you’re dropping 1.5 inches or more, the answer is usually yes.
Red flags that suggest a different path:
- You want the car slammed at 3+ inches and don’t plan to track it — consider air suspension instead
- You’re doing frequent track days with tire changes between sessions — you’ll want independent 4-way damping adjustment, which is a step up from this kit’s simultaneous adjustment
Questions to ask Undergrounddynamics before checkout:
- Are higher spring-rate options available for the Type-S?
- What’s the current lead time and shipping policy?
- Is the camber plate upgrade in stock for UA6 fitment?
Pro Tip: Check the Undergrounddynamics suspension upgrade guide for the full mod sequence. Coilovers work best when paired with sway bars and an alignment — buying them in isolation leaves performance on the table.
Ready to order your Acura TL coilover kit?
Undergrounddynamics stocks the TruHart StreetPlus kit with model-specific fitment for the 2004–2008 TL. You get the spec sheet, product photos, and installation documentation upfront — not buried in a PDF you have to request.
Head to the coilovers and suspension category to find the UA6/UA7 kit, compare spring-rate options, and add camber plates or hardware at checkout. If you have fitment questions or want to discuss a custom spring-rate setup, the product page includes direct contact options. Shipping and return policies are listed at checkout. Order, confirm your chassis code, and get your TL handling the way it should.
Key Takeaways
The TruHart StreetPlus coilover kit from Undergrounddynamics is the practical, spec-verified choice for 2004–2008 Acura TL owners who want real handling gains without sacrificing daily drivability.
| Point | Details |
|---|---|
| Fitment confirmed | Kit fits all UA6/UA7 trims (2004–2008), including Type-S and AWD variants. |
| Drop range | Stay within 1–2 inches of drop to preserve damper travel and avoid bottoming. |
| Damping setup | Start at 16–20 clicks from soft for spirited street use; adjust in 5-click increments. |
| Alignment is mandatory | Book a four-wheel alignment after install — skip it and you’ll wear tires unevenly. |
| Undergrounddynamics kit | The TruHart StreetPlus offers adjustable damping with many increments, rebuildable construction, and full spec documentation. |
Why model-specific fitment matters more than you think
The aftermarket coilover market is full of kits that “fit” the TL in the sense that the bolts go in. What they don’t always deliver is correct geometry, appropriate spring rates for the chassis weight, and documentation that tells you what you actually bought. That gap between “it bolts up” and “it works correctly” is where most buyer regret lives.
Model-specific kits sourced through a retailer like Undergrounddynamics that publishes spec sheets, chassis codes, and install guides close that gap before you spend a dollar. You’re not reverse-engineering fitment from a forum thread. The spring rate, click count, and top-mount type are listed. If something doesn’t match your use case, you know before checkout, not after.
The other thing worth saying plainly: a coilover kit is a long-term investment in how the car drives. Buying the cheapest option to get low is a different decision than buying a kit that improves handling and lasts. Know which one you’re making.
Useful sources and further reading
- Undergrounddynamics TruHart StreetPlus coilover kit (UA6/UA7) — product page with spec sheet and fitment confirmation
- Undergrounddynamics suspension category — full suspension catalog including coilovers, air ride, and lowering springs
- Acura TL suspension upgrade step-by-step guide — internal install guide for DIY reference
- Acurazine: 2004–2008 TL suspension modifications — community how-to covering coilover install, drop limits, and cost estimates
- Acurazine forum: best coilovers thread — owner discussion on spring rates, camber plates, and kit comparisons
| Resource | Best for |
|---|---|
| Undergrounddynamics product page | Spec verification and purchase |
| Undergrounddynamics install guide | DIY step-by-step reference |
| Acurazine how-to | Cost estimates and drop-limit guidance |
| Acurazine forum thread | Community spring-rate and camber-plate discussion |
FAQ
What years does the Undergrounddynamics TL coilover kit fit?
The kit fits all 2004–2008 Acura TL models on the UA6 (FWD) and UA7 (AWD) chassis, including the Type-S. It does not fit the 2009–2014 generation (UA8/UA9), which requires a separate kit.
What coilovers work best for daily driving on a 2004–2008 TL?
A street or street-plus setup with adjustable damping set in the lower half of the range and a 1–1.5 inch drop gives the best balance of comfort and handling for daily use. Rubber top mounts reduce cabin noise compared to pillowball alternatives.
What year Acura TL should you avoid?
The 2004 model year had a higher incidence of transmission issues on the automatic; many enthusiasts recommend 2005–2008 for better reliability. For coilover fitment, all four years use the same UA6/UA7 chassis and are equally compatible.
Is the Acura TL basically a Honda Accord?
The 3rd-generation TL (2004–2008) shares platform architecture with the Accord, but uses a stiffer chassis tune, different suspension geometry, and a more powerful engine. Coilover kits are chassis-specific and not interchangeable between the two without fitment verification.
How long does it take to install coilovers on an Acura TL?
A DIY install typically takes 4–6 hours with basic tools and a spring compressor. A professional shop can complete the swap in 2–3 hours. Budget additional time for a four-wheel alignment appointment after installation.
