How to Install BBK Varitune Cat-Back Exhaust (1986 GT; 87-93 LX, Cobra; 94-04 GT) on your Ford Mustang

Follow these instructions carefully to ensure correct fitment and operation.

STEP 1: Lift the vehicle and support using jack stands.

STEP 2: To aid in removal of the stock exhaust system a sawz-all is required.  

STEP 3: Remove the bolts connecting the exhaust pipes and cut somewhere between the axle and the back of the muffler.  

STEP 4: View the picture on page 3 to see how all the tubing will be fitted and lined up for installation.  

Slide the flared flanges over the head pipes so that the flared end of the flanges match the flared end of the head pipes as shown.  

STEP 6: Place the head pipes into the correct location  and snug the bolts enough for some adjusting  room. Slide the 2 3/4” clamp over the muffler inlet  and slide the muffler over the head pipe then  snug the clamp down. ​

Use the hanger and saddle clamp for the outlet  of the muffler. Slide the hanger through the  corresponding rubber grommet on the chassis  then snug the hanger into the saddle clamp and  tighten the locking bolt to hold the hanger in  place. 

STEP 8: Slide the over axle tube into the muffler then  snug the saddle clamp. Slide the 2 3/4” clamp at  the end of the over axle tube. 

STEP 9: Slide the hanger on the exit tube into the correct  rubber grommet, then slide the tube over the  over axle pipe. Snug the clamp. NOTE: THE  87-93 GT HAS WELDED HANGERS ON THE  EXIT PIPES. 

STEP 10: For passenger side installation repeat steps 4-8.

STEP 11: Make final adjustments and tighten the axle back system starting from the front.  ​