yep i put 611HP to the ground with s4's stock valve train with no problems at 29psi for a long time! back in the day......
__________________
Glenngieering
[/URL]
"AEM Speed Density Proper Real time Tuning Specialist"..... I DO NOT TUNE ROM/MAF SYSTEMS ! Glenngineering
Last edited by hiboost; Jul 24, 2008 at 08:27 AM.