Join Date: Oct 2009
Location: Sudbury, Ontario
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I wouldn't bother doing this swap, even if I was given the SRT4 muffler for free.
You did nail the first bit on the head about the inlet sizes being different.
The stock CSRT muffler is probably higher flow then the SXT, but I wouldn't suspect by much.
If you are buying a muffler, get something with the proper inlet size. It'll be cheaper and probably a lot less restrictive.