Do it Yourself Exhaust: Installing an MRT Performance Exhaust System

At MRT, we pride ourselves on offering premium, high-performance exhausts that are also easy to install. In fact, most MRT exhaust systems can be installed in 60 minutes or less using standard shop tools.

Still, we understand many people may want some extra help – especially because a poor installation can cause serious performance and safety issues. We’ve put together this DIY exhaust setup guide to provide everyone with the basics.

For our overview, the instructions are based on the MRT Interceptor exhaust system for the Ford Mustang. Remember, the process can vary slightly based on the exhaust design and the vehicle, so check the provided instructions before getting started.

Installing an Axle-Back Exhaust System

The DIY exhaust installation process starts with removing the factory exhaust. Start by locating the tangent, which is the beginning of the last factory tube bend before the muffler, on both the left and right sides. Mark a line at the tangent and cut the current tubes two inches inward from this point. Remove any muffler mounting brackets, then remove the stock mufflers and any rough metal from the edge of the factory exhaust tube.

Now it’s time to put in your new MRT axle-back system. Begin by sliding the included band clamps onto the tailpipe and sliding the muffler into position over the factory pipe. Insert your factory mounting brackets into the new exhaust (keeping the OE orientation) and align the tip with the rear fascia opening. This can be done by sliding the assembly connection points in and out while rotating the tubing. Once you’re happy with the alignment, position the clamp(s) at the edge of the aftermarket exhaust – making sure it extends slightly past the end of the tube – and tighten the clamp(s) and brackets while maintaining the alignment.

How to Install a Cat-Back Exhaust

Since you’re replacing more parts, a cat-back exhaust installation is a little different. The first step is to loosen the two collars that attach the catalyst downpipes to the factory exhaust. For some vehicles, this requires prying off metal clips from the locking tab. Remove the bolts holding the stock exhaust mounting brackets and grommets, then remove the factory exhaust system. (This may require a second person.)

To install the aftermarket system, locate the tubes that are being used to connect the downpipes to the new MRT H-pipe, then slide the H-pipe onto the outlets using the expanded/slotted tubing side, making sure the longer side is on the driver’s side. Pop one of the included band clamps over each side and snug them up (don’t tighten them just yet.) Re-install the brackets and grommets, then slide the driver’s side under-axle pipe into the H-pipe who also sliding the hanging rod into the driver-side grommet. Repeat this for the passenger side. Once both under-axle pipes are set, put a band clamp onto the pipe on each side and slide the muffler in. Tighten the clamps one at a time beginning closest to the engine bay and working towards the rear bumper. After each clamp, recheck the exhaust tip alignment.

If you have further questions, contact MRT by phone or email. We provide a superior customer experience to support backyard mechanics who love a great exhaust system.