Quote:
Originally Posted by 911pcars
You said: "......So far, I haven't noticed any falling off of power at higher rpms"......
My point was that one shouldn't miss the extra power if the installed components aren't optimized/optimal in the first place. We all experience the limitations of the engine we have. Unless your engine previously produced more power with the same configuration, why would you miss a reduced amount that was never produced?
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When I rebuilt my engine I added displacement, compression, different cams, larger port heads and modified the CIS system. Even with all of this, the SSI exhausts (which were on the otherwise stock 3.0 SC engine) still flow well enough to let the new engine configuration make increased power at higher (7,000) rpms. If the exhaust capacity was restricted, it would not do so. While an engine might make a marginal amount of more top end hp with larger diameter header type exhausts, they would take away from the bottom end and mid range torque levels. Engines are always a compromise, so you have to decide which is more important to you, good street driving characteristics or 5 extra horsepower at redline.