i ordered one and ended up with two (yes, i had to pay for both), long story.
anyways, magnaflow part #15644 for 99-04 mustang cobra with irs. new in box and never opened.
MagnaFlow Performance Exhaust
$375 plus shipping
calculate shipping from 89128
package is 57½ x 15½ x 13 at 60lbs
i have the infamous irs 'clunk' when changing gear, letting off the throttle, going to reverse, etc, and am going to start replacing bushings as the car has in excess of 100k on it. not having the funds/time/ambition to take the whole rear end apart and replace all the rubber with poly or...