Simpson Racing CarbonX® Ultimate™ UnderwearCarbonX Ultimate underwear is made from double jersey interlock knit comprised of a patented blend of high performance fibers and has extraordinary thermal protective properties. It is inherently flame resistant, will not burn, melt, or ignite when subjected to direct flame. Nomex or CarbonX Underwear underneath a racing suit will dramatically improve Thermal Protection Performance (TPP) in the case of an accident involving fire.

000” of thread adjustment and accepts both ½” and 12mm bolts

Whether you’re building a high-horsepower LS swap

Due to the aggressive nature of this race inspired clutch

QA1 offers spanner wrenches and thrust bearing kits individually and as a complete kit

The polyurethane bushings included provide better performance than OEM rubber bushings

The sway bar is CNC-formed for exact manufacturing tolerances and repeatable high quality

These silver powder coated springs fit perfectly with QA1's Pro Coil Shock Systems

Our 4th Gen F-Body Viking Crusader Kit includes the following:

The Vibrant merge collectors expanded inlets are designed to fit perfectly with Vibrant Stainless Steel piping

They are a direct bolt-on replacement for your vehicle

as it mixes to similar ratios at a much lower price

gearbox oils