CUSTOM VALVING AVAILABLE
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Built to order. Not sure which spec you need? Spec your build with us →
The BMW G8X M2/M3/M4 TL-PRO Coilover System is Thunder Lane’s flagship true 3-way adjustable coilover for the BMW M2 (G87) / M3 (G80/G81) / M4 (G82/G83), built for serious track use — time attack, hill climb, road racing, autocross, and HPDE. Every set is hand-assembled in Poland and bespoke-valved to your goals.
Built for Racing, Time Attack, Autocross, and HPDE
Separate circuits for rebound, low-speed compression, and high-speed compression let you tune platform support, curb compliance, and braking stability independently. Every kit can also be valved specifically for street use — the compliance needed for competent track use often makes for a comfortable street ride, since controlling the platform better also controls body motion better on the street.
Technical Specs
- 46mm monotube damper
- 20-click rebound, 34-click low-speed compression, 18-click high-speed compression (true 3-way)
- Independent Ride Height and Travel Adjustment
- Remote reservoirs with quick disconnects, customizable hose length
- 2.5" linear springs, customizable rates (Swift optional)
- CVP + PVP dyno graphs included with every kit
Construction & Hardware
Check valves improve response and consistency across long sessions, keeping the damper stable as temperatures rise. Electroplated shock bodies resist corrosion, spherical bearing top mounts/camber plates hold alignment under load, and every damper is fully rebuildable with individual replacement parts available.
Fitment
BMW M2 (G87) / M3 (G80/G81) / M4 (G82/G83).
Frequently Asked Questions
What’s the lead time?
4–6 weeks, built to order.
What’s the warranty?
6 months — void for track damage, covers unreasonable wear and defects only.
What’s the benefit of 3-way adjustability?
It lets you tune chassis support (low-speed), impact/curb compliance (high-speed), and rebound control independently.
Can you help me choose spring rates and valving?
Yes — spring rates, valving profile, top mounts, and reservoir hose length are all selected during the build.
Is this streetable?
Yes — every kit can be valved specifically for street use if that’s your preference. Even with track-oriented valving, the compliance needed for competent track use often makes for a comfortable street ride, since controlling the platform better also controls body motion better on the street.
Racing Thunder Lane suspension in Time Attack, Hill Climb, or wheel-to-wheel? Ask about product credit through our contingency program.
Want the full breakdown for your chassis? Read the BMW G8X coilover buying guide.
Not sure which spec you need?
Tell us the chassis, how the car is built, and how you use it. We spec the kit before anything is assembled.
Spec your build with usWe build every suspension set to order and want you to know exactly what to expect from checkout to delivery.
Build Lead Time (Made-to-Order)
Because every set is machined and assembled for one specific car, most orders require a 4–6 week lead time to machine hardware and complete assembly.
Every set is built 100% in-house in Kraków, Poland—no outsourced assembly, no pre-built inventory.
Shipping Time to the United States
Once your order is complete and ready to dispatch, typical shipping time to the U.S. is 5–10 business days.
Transit time can vary slightly depending on carrier, customs processing, and your location.
Where We Ship
We currently ship to the United States, Canada, Mexico, and Central America, with free shipping to every destination we serve.
Order Processing & Tracking
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You’ll receive a confirmation email after placing your order.
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We’ll reach out to confirm your build spec—spring rates, valving, and ride height—before production begins.
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When your order ships, you’ll receive an email with tracking information.
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If your order includes multiple items, they may ship together or separately depending on production status.
Important Notes
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Lead times are estimates and may change based on current workload, parts availability, or production volume.
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Business days do not include weekends or holidays.
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International shipments may experience customs-related delays outside of our control.
Need Help?
If you have a deadline (event, track day, or travel schedule) or want an update on your order, contact us and we’ll do our best to help you plan accordingly.
