Its the reverse. Stainless steel releases heat slower and has a rather high heat capacity so the heat from the exhaust doesn't make the engine any hotter than it needs to be.

there are so many factors to decide on how an exhaust is to be tuned. Usually the factory stuff is tuned for the ideal balance to THEM. you should also take into consideration your driving behaviour and also the terrain which you would more frequently encounter to get better optimization.

like F1 cars have a lot of valve overlap, with minimal flow restriction on the exahust and intake. The exhaust also features scattering to reduce resonance at maximum output.

If you took that system and fitted it onto your car, first of all it wouldn't start. Then even if you could, you would have to set the idling at 6000 rpm minimum. Also, you would complain about the lack of pickup at lower rpms and heavy fuel consumptions cos the cams are tuned for very high throttle duty cycles.

All in all, there is no fixed tuning formula for each person.

This post has been edited by sakaic: Aug 28 2006, 04:25 AM