I was measuring my exhaust to see which muffler size I needed and realized something. The previous owner installed a catted x-pipe. The exhaust manifolds are stock and the cat back is stock with Flowmasters replacing the factory mufflers.
The x-pipe is 2 1/2 inch, the stock cat back pipes are 2 1/4. The flanges match up fine and there are no leaks. My question is, how would that effect things going forward? In a few months I will be adding headers and planning on changing out the mid-pipe to an off road, then I wanted to get rid of those Flowmasters and go with Super Turbos. I never intended on replacing the rest of the cat back pipes, just cut out the FMs and weld in the STs. So that means I'll have headers, a 2 1/2 mid pipe and 2 1/4 cat back. I really don't want to have to buy a new cat back if I don't have to, I'm just not sure if that 1/4 inch smaller cat back will have any real negative effect on things.
The x-pipe is 2 1/2 inch, the stock cat back pipes are 2 1/4. The flanges match up fine and there are no leaks. My question is, how would that effect things going forward? In a few months I will be adding headers and planning on changing out the mid-pipe to an off road, then I wanted to get rid of those Flowmasters and go with Super Turbos. I never intended on replacing the rest of the cat back pipes, just cut out the FMs and weld in the STs. So that means I'll have headers, a 2 1/2 mid pipe and 2 1/4 cat back. I really don't want to have to buy a new cat back if I don't have to, I'm just not sure if that 1/4 inch smaller cat back will have any real negative effect on things.
