SPT PERFORMANCE EXHAUST SYSTEM
(Part Nos. 5–Door WRX Exhaust: D441SFG000, 4–Door WRX Exhaust: D441SFG100)
The SPT exhaust system opens the exhaust flow and provides a more performance–oriented sound. Separate systems were developed for the WRX 4–Door and 5–Door models.
REMOVE STOCK EXHAUST
Installing the cat–back performance exhaust is most easily done on a lift.
Remove bolts attaching the rear muffler(s) from the exhaust pipe. The WRX 5–Door has one muffler; the 4–Door has two. Coat hangers and hanger bushings with spray lubricant to make removal easier. Each of the 4–Door’s mufflers has two hangers; the 5–Door’s muffler has four.
Slide the muffler(s) off the hangers.
Separate the rear exhaust pipe from the center pipe.
The end of the pipe is attached to a hanger. Spray hanger and hanger bushing with lubricant, and slide off the pipe.
INSTALL PERFORMANCE EXHAUST
Spray lubricant on the bushings and hangers.
Slide the rear exhaust pipe bushing onto the hanger.
Using a new gasket, bolt together the rear exhaust pipe and the center exhaust pipe. (Tightening torque: 13.3 lb–ft.)
Install the muffler(s) on the hangers, using new gaskets. Bolt them to the exhaust pipe, using new self–locking nuts. (Tightening torque: 35.4 lb–ft.)
After completing assembly, degrease the hangers and hanger bushings before taking the car off the lift.