APR Valve Spring Kit | MK2 TT RS C7 RS7 4.0L Turbo V8 Internally the system is open

Internally the system is open with an small offshoot path leading to the main chamber designed to bounce soundwaves back into the exhaust flow path to eliminate unwanted frequencies

thanks to our billet turbo inlet adapter

Integrated Engineering valve guides are designed to directly replace OEM valve guides

For everyone else

Integrated Engineering 164x20 Forged Connecting Rods

APR Valve Spring Kit | MK2 TT RS C7 RS7 4.0L Turbo V8 Internally the system is openThe 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