Stillen Headers

Denny McLain

Not exactly sure what to think about the whole thing as I did Gen 3 intake, headers and exhaust having some issues with fit. (already had the high flow cats) Called Josh up at Stillen personally as the exhaust clearance was extremely tight and one side sat lower than the other. He said they were out testing a GT-R and someone would get back. No one did.

Last weekend I had Cobb in Plano Tx dyno/tune the car. IF......If the dyno's are the same, the car only picked up 16 hp from the intake, headers and exhaust over the stock arrangement with high flow cats. Even more disappointing was the car gained zero from the tune. This still has me extremely puzzled. The air/flow ration changed but the power output didn't. Even Cobb is mystified but we did have an issue of the intake temps ranging between 106-108 and the car perhaps didn't like the hot air. Dunno??

When the weather cools some here in Dallas I'm taking the car back to the original shop where I have the dyno baseline for retuning and better comparison. Also looking forward to the cam software but so far I'm not exactly jumping for joy with either the fit quality or the real world gains.

Hoping for a little luck, but I'm currently confused like a big dog.