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Magnaflow Catback System Installation Guide ('87-'93 Mustang GT)

Installation Time

2 hours

American Muscle
Shop Parts in this Guide


1. To begin removal of your OEM exhaust system, you will need to cut the tail-pipes just behind the mufflers. Remove the tail pipes from the OEM rubber insulators. Do not damage the OEM rubber insulators, as they will be re-used with your new system. Next unbolt the extension pipes from the H-pipe and remove the mufflers from their OEM rubber insulators. Do not discard the fasteners required to bolt the extension pipes to the mufflers, as they will be 

2. Remove the existing muffler mount brackets, and replace them with the new brackets supplied in the kit. Do not discard the OEM mount fasteners, as they will be re-used. Refer to diagram #2 for installation of the new muffler mounts.

3. Starting at the H-pipe, begin installing your new exhaust system by bolting up the front extension pipes with the flanges supplied in the kit and the OEM fasteners. Leave all clamps and fasteners loose for final position has been set. Working rearward, install the mufflers, and tailpipes using the supplied U-bolt clamps. Then install the polished tips using the supplied band clamps, hangers and set-screws.

4. Adjust all components for clearance of the frame, bodywork, and overall aesthetics. (MAGNAFLOW recommends at least 1/2" of clearance between the exhaust tips and the rear fascia to avoid heat related body damage or fire.) Once a final position is chosen for the new system, evenly tighten all fasteners from front to rear. The supplied band clamps must be VERY tight to properly align the pipes and prevent leaks (Approximately 65 ft-lbs). U-bolt clamps should be tightened to approximately 30-35ft-lbs. Inspect all hardware after 25-50 miles of operation, and re-tighten if necessary.

Installation instructions provided by Magnaflow

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