3" or 2.5" cat back system?
 

Question on catbacks....

Does a MAC 3" catback system hook up to the stock cats? or will I need to change them as well.....(not that I shouldn't)....

Also, is there a huge difference between the 2.5 and 3 inch systems....other than the obvious?

RE: 3" or 2.5" cat back system?
 

Unless you're running some serious FI, don't get a 3 inch setup. It will virturally eliminate all back pressure and you're hemorrage torque with it. 2.5 inch is what you need.

RE: 3" or 2.5" cat back system?
 

+1

RE: 3" or 2.5" cat back system?
 

also i had a question as well,with a bassani catted x with slp lm1's,im thinking about going with shorty headers,and just wondering will all this help with the horsepower or hurt it from not enough back pressure.

RE: 3" or 2.5" cat back system?
 

You will gain HP, but shorties give minimum power compared to long tubes. If you do not want to eventually switch to long tubes and a shorty mid pipe, then shorty headers would be better then nothing.

RE: 3" or 2.5" cat back system?
 

What are people's thoughts on pypes systems?