which power kit do I get

[stiggerq]

Michael,
I used to work for a company called PPR (pacific power racing) on silverstone race course. We used to manufacture all manner of complete exhaust systems for cars such as fomula 300, williams renault touring cars and the porsche but to name a few.
As has been stated in this thread it is very very hard to get ANY performance gains out of changing the system for some shiny model on the porsche. We had to develope a system for the carrera 4 and managed to get hold of a Porsche GB system to compare. Even with improved welding techniques (TIG as apposed to the mig used) pulse tuning the very short system and using different lengths of perforated bends inside (radius formed) we saw only losses !!
In the end we had a guy who uesd a venturi system (several cones and changes of size) different types of damping material we only ever made a 7hp gain on superchips rolling road.
A full pulse tuned gas flowed system with reduced core catalist would be both expensive and although it would reduce restriction it would only be enough to see very small gains.

Hope this helps

Regards
Steve