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Challenge BMW M Tri Color Roof Decal Kit ( M4 Proto style )

First introduced on the F82 M4 Prototype in Pebble Beach and on prototype E92 M special edition cars, our Tri – Color M Roof Stripe package attempts to make this …

challege s2000 offset delrin front bushings

S2000 Front Control Arm Delrin Offset Bushing Set

S2000′s can use more camber in front especially when running non staggered wheel and tire sizes. Other options include offset lower balljoints which can be costly or adjustable upper balljoints …

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Challenge Audi R8 V8 Prototype Exhaust Testing

Here is a quick rev video of one of our latest exhaust projects. This full stainless exhaust even includes vacuum controlled valves like the factory unit to seamlessly install into …