Don't forget the up pipe. VERY IMPORTANT for your car. The up pipe has a cat in it as well, but that pipe is right before the turbo, and if anything goes wrong, it may/will send bits of metal into your turbo, and BOOM, or so I read.
As far as the open source vs AP goes, the AP is re-tunable, whereas the open source is kind of a one-shot deal, where you load a new map into your ECU, and there it stays until you change it. Your dealership can tell if you change the mapping, and this will most likely void any warranty. The AP can be changed any time, but should also be returned to stock mapping and removed b4 dealing w/ the dealership (along with any other go-fast goodies), especially if you break something and want it covered under warranty. If I'm wrong here, feel free to correct, I could use proper info as well, this is just my understanding and I'm still a noob. (LOL! spell check doesn't approve of my spelling for noob)
Last edited by new 'bru; 02-29-2008 at 01:24 PM.
Reason: adding info