3. Now it’s time to install your new cat-back. Begin with the tailpipes first, slipping the tailpipe over the rear axle. Once over the axle portion is in-place, slide the wire form hangers through the rubber hanger on the car, which you have just installed. If you purchased a kit with 3” add-on tips, slide the tips on to the tails
and slide the additional hanger through the boss on the tip. Now install the hangers into the rubber mounts. A small amount of grease or liquid soap will allow the hanger to slide through easier.
4. Next, install the mufflers on to the tailpipes. These kits were supplied with offset/ center mufflers. The center inlet must point towards the front of the car. Again, a small amount of grease in the muffler inlet and outlet will allow for easy rotation when adjusting for the perfect fit.
5. Next, install the y-pipe into the inlets of each muffler. A small amount of grease will also help here too. Some V6 years may require the supplied y-pipe legs to be cut shorter. Connect the flange on your new system with the factory y-pipe and snug the nuts. Now install the four clamps on the muffler necks, snug the nuts, but DON’T TIGHTEN. Once these clamps are tightened you will not be able to adjust any of the components.
6. Last, make all your final adjustments for fit. Make sure the mufflers are flat and parallel to the ground. Rotating the mufflers and tailpipes slightly will get you the best fit. Also, make sure the tailpipes are positioned in the correct location under the rear bumper. Once you are satisfied with the fit, tighten all four clamps, tip hardware and the connection points at the y-pipe. Air tools will allow the tightest clamping possible. Now it’s time to fire up your mustang. Remember to listen and check for exhaust leaks. Also, periodically check all connections points as they may come loose.
Installation instructions provided by Pypes