Reviving the dead here.... I am at the same crossroads as the thread op, but I am seeing high rpm break up. Happens at 9.8psi and above, feels just like failing coil packs at 6k and above. I am guessing spark blowout, but I am curious about what you have seen.Also, are you having high RPM break up and if so, at what psi level does it occur?
Valve Spring Install Question
So after installing my twin turbos and going through tuning with Lund he said to replace my valve springs to correct exhaust timing being thrown off at higher rpm. So I got a set of PAC 1234X springs and the ST-105 tool to replace them . I did my oil pump gear install when I bought the car...
www.svtperformance.com
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