Upgrading exhaust system on 89 carrerra

[anguspatterson]

I am looking to upgrade the exhaust system from the extractors through to the muffler. Have read the specs from the Porsche guide on increased power that this will provide (mostly mid range which is what I am after). Two questions I hope my peers can assist. Has anyone done this and what was the result in terms of feel and increased power through the gears; secondly does it matter if you don't buy porsche parts and instead look for other alternatives (which are from my research up to 50% cheaper).

Thoughts ?