Well its income tax time and I got some decent money coming back to me. My 2005 Grand Prix GXP is in storeage and is screaming to get some work done. I need a few questions answered.
First off I am going to be doing the exhaust. Looking at putting on a highflow cat. However I was wondering what is the factory catalytic convertor input size? I want to do a 3" cat back. into 2 Flowmaster Super 40s.
Second is there any cheaper intakes than the K&N that has proven to be a good mod for the GXP? With the K&N intake does it have a tray for the PCM to be bolted down? I dont want to zip tie the PCM down or cut apart my factory airbox.
Third is a Thottle Body spacer going to give me any noticeable difference or benefit me? I see some people saying do it, and some saying its a waste of $100.
Also Ive been hearing a lot about flipping a motor mount or changing the mounts? Any suggestions on this while Im working on it?
Last where is my best bet to send in my PCM in for a tune? Ive thought about a handheld but not so sure on it...
