I've spent almost the last 2 years reading posts on the v6 mustang boards about exhaust to know what im talking about. You have to take my judgement here because I know I'm right. Don't mean to be cocky, its just the truth.
Unless you have some serious modifications (aftermarket heads, intakes, cam, etc) dont get 2.5", get 2.25.
2.25 comes stock on the Mustang GT, so if you can find the H pipe off a GT you can bolt that on, and that is the perfect fit.
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2004 Mustang GT 5 Speed
Mac O/R H Pipe
Mac Flowpath Catback
JLT Ram Air Intake
SCT XCal 2 Tuner
FRPP 4.10 Gears
13.191 @ 103.78
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