APR Valve Spring Kit | 42 R8 · 4S R8 | 5.2L V10 B8 Q5 (8R) 3.0L SC V6 Rev limiter increased to 7000RPM

Rev limiter increased to 7000RPM (automatic trans limited)

The two most important dimensions of a connecting rod are the tolerances and roundness of the crankshaft journals and wristpin bushings

The system is also compatible with stock and larger turbocharger systems

Adding the optional cast turbo inlet upgrade further reduces significant air restrictions while maintaining the largest size possible from the airbox to the turbocharger

factory-like fit without interference or annoying rattles

APR Valve Spring Kit | 42 R8 · 4S R8 | 5.2L V10 B8 Q5 (8R) 3.0L SC V6 Rev limiter increased to 7000RPMThe APR Valve Spring System is a high performance, lightweight upgrade designed to increase valve control and eradicate valve float common on many applications. APR's design specifications called for a valve spring, retainer and spring seat combination that doesn't overpower and snap the OEM valves or erode the aluminum spring seat, while still maintaining exceptional valve control. The result is an advanced design that's 28% lighter yet 20% stiffer