[compinsating]

Originally Posted by thstone

The TopSpeed cat back muffler will slightly increase horsepower at the upper RPM's. Here is a link that includes my dyno test data.

Bottom line: Net increase: +7hp @ 6150rpm. Peak +2 hp. All of the gains come above 5800 rpm. No appreciable difference in hp up to 5800.

http://986forum.com/forums/boxster-racing-forum/46070-spec-boxster-build-4.html

I wish there was more that could be done to these motors i want to add 70hp not 7 lol i guess i should have went with the S