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2.5" piping. Seb's car has upgraded Stillen ICs (I believe) and OEM intake piping. However, Seb's car has larger valves, so there is a net positive effect he has there whereas Dee's car and my own do not. How these may "wash out" I'm not certain, but I'm really inclined to say that the major differences we are seeing in spoolup and power output (across the RPM band) are a direct result of how the hot section of the turbocharger is functioning and much less to do with the other variations in the setups. How much massflow you put through the engine is primarily dependent on what the compressor is doing.

[ ashspecz.com ] [ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
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