well, i had 2 flowmaster mufflers welded in for a like $180 total (including muffs). so i wouldnt imagine that yours would be much more than $50 because those mufflers arent but like $40 and the flowmasters are like $75 each. and im guessing you still have single exhaust...
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1994 Mustang GT, just a few minor appearance mods, engine mostly stock (for now)