exhaust help please

U2SLO450

Member
May 27, 2006
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i bought a 90 mustang gt with an american thunder cat back already installed on it but i dont know what size it is (2.25 or 2.50) the question is does it matter what size mufflers (2.25 or 2.50) i buy or would a shop be able to fit either one on there
 
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So are you saying that either size will fit? I just dont want to order the wrong size diameter mufflers, could i just measure the diameter of the tailpipes since they are cut off?
 
well if you have a 2.25 cat back...the shop can expand the pipes to fit a 2.50 muffler. but if you have a 2.50 system the 2.50 muffler's will fit.

but if you have a 2.50 catback and buy some 2.25 mufflers they will need to size down to the smaller mufflers