When shopping for an exhaust system for your Mustang, it's advisable to choose a comprehensive system from a reputable manufacturer. That way everything should fit and work as advertised. After all, when you're knee deep in the installation is the wrong time to discover something doesn't line up!
Fortunately for us, MBRP exhaust makes a complete T304 stainless steel exhaust systems; headers to tips for 2015-2019 Mustangs. MBRP's PRO Series 3-inch Header Mid Pipe Kit with Cats (PN S7245304) includes long-tube headers featuring 1-7/8-inch primaries, 3-inch merge spike collectors, and 3/8-inch thick laser-cut head flanges. The mid-pipes are 3-inch and feature metallic substrate catalytic converters. Since the oxygen sensors are relocated, O2 extension harnesses are also included.
MBRP's 3-inch PRO Series "Street" Cat Back for 2018-up Mustangs (PN S7205304) offers a mild tone, which is perfect if you want to remain on good terms with your neighbors. The system features 3-inch T304 stainless steel tubing throughout, an H-pipe, stainless mufflers, and 4-inch dual wall polished tips.
The header/mid-pipe and cat-back systems form a complete exhaust solution for S550-chassis Mustangs. The header installation was the most involved part of the process but having a lift at our disposal made the process easier. The rest of the exhaust system followed the factory path and used the OEM hangers. Follow along as we show you how we did it.
The MBRP PRO Series exhaust system includes headers, catalytic converter-equipped mid-pipes, an H-pipe, and a muffler system with quad polished tips. Everything is T304 stainless steel and features 3-inch tubing from the collectors back. The headers primaries are 1-7/8-inch.
We were impressed with the quality of the MBRP stainless headers. The 3/8-inch thick laser-cut flanges also have slotted holes to ease installation.
The mid-pipes include catalytic converters and 3-inch mandrel-bent tubing.
The MBRP cat-back system includes a 3-inch H-pipe that will give this 2018 Mustang a classic muscle car tone. Note the taper at the front that adapts to factory mid-pipes. We'll trim this off to fit our MBRP header/mid-pipe setup.
All the necessary clamps and hardware are included as well as oxygen sensor extension harnesses.
We began the process by removing the factory cat-back system. It's pretty straightforward as it comes down in one piece.
Next, we loosened the mid-pipe clamps and separated the mid-pipes from the catalytic converter down pipes.
We used an oxygen sensor wrench to remove the factory oxygen sensors.
Next, we disconnected the steering shaft from the steering rack to allow some extra working room on the driver's side.
Then, we removed the front crossmember brace.
Moving to the passenger's side, we removed the starter.
With the engine supported, we removed both engine mounts.
With the motor mounts out of the way, we could easily remove the factory headers. We kept the factory metal gaskets in place and reused them.
We slid the headers up into place and secured them with the supplied hardware. The headers tucked up nicely for excellent ground clearance.
With the headers installed, we slid the mid-pipes over the collectors and loosely installed the band clamp.
The cat-back includes nicely tapered reducers to hook up to the smaller factory exhaust tubing. Since we were using MBRP's headers and mid-pipes, we cut the reducers off of the H-pipe where indicated.
With the H-pipe trimmed, we slid it into the expanded sections of the mid-pipes.
As we assembled the system front to back, we left the clamps loose and supported the H-pipe.
The final sections of the axle-back system were installed, and the clamps left loose.
We used the factory hangers to position the exhaust during assembly.
The MBRP system's polished, 4-inch dual wall tips included the company's logo and attached to the mufflers' outlets.
We continued by installing the left side axle-back system and left the tubing clamps and tips loose until final adjustments were made.
We carefully adjusted the entire exhaust system to maximize clearance around the chassis and suspension before tightening the clamps.
Finally, we centered the tips in the rear valance's exhaust openings before tightening the tips' clamps.
We were very impressed with the fit and finish of the MBRP system. We didn't lose any precious ground clearance, and the sound was deep and authoritative without being obnoxious. We didn't dyno our setup, but MBRP claims system gains of up to 44 horsepower and 28 lb-ft of torque at the rear wheels.