Despite achieving our 400 WHP goal, we installed a Borla S-Type Cat-Back Exhaust to further increase power, reduce weight, and improve the sound of our Mustang. We also found a bit more power in the tune and conducted a few air intake tests.
In Part 2, it only took a K&N intake, a 2018+ Gen-3 intake manifold, and a tune from Palm Beach Dyno to make over 400 WHP in our Mustang. We were ecstatic to reach our goal so quickly and easily, but there was still some tuning left to do, intake tests to perform, and an exhaust to install.
We have used Borla Exhausts on a lot of our Mustang builds and have been extremely happy with the improvements in performance and sound. We picked up 7 WHP from the Borla/Ford Performance Touring Cat-Back Exhaust in our 2016 Gen-2 Coyote Mustang, and an impressive 12.91 WHP from their S-Type exhaust on our 2018 Gen-3 Coyote. The Gen-3 S-Type just might be the best sounding Coyote exhaust system I’ve ever heard. It transforms the exhaust note to sound like the old (better sounding) 3-valve engine. Needless to say, installing this exhaust would round out using Borla on all 3 generations of Coyotes. We were looking forward to the results.
The Borla exhaust arrived in two large boxes.
We went with the Borla S-Type Cat-Back Exhaust (Part # 140515BC) which is made from premium 2.75” T-304 stainless steel and features a black chrome finish on the T-304 stainless steel exhaust tips. This will be a nice, aggressive visual contrast against our silver car.
The S-Type muffler is Borla’s quietest cat-back exhaust system for the 2012-2014 (Gen-1 Coyote) Mustang GT and it was incredible on our 2018 Mustang GT. We really liked their quieter “Touring” muffler on our 2016 Mustang and would have chosen that if we had the option. Both exhausts have the perfect combination of performance and sound that make driving more exciting and engaging, and are quiet enough to live with every day without droning.
While I love the performance of the 5.0L Coyote V8, I find most aftermarket exhausts make them obnoxiously loud with a poor sounding, trumpeting pitch. This is exponentially worse if the car has a cat-delete and/or long tube headers. Thankfully we already reached our power goals since not many mufflers can quiet down cat-delete pipes or long tube headers, which would have given us another 10-15 WHP+ gain if we needed it.
If you intend on getting rid of your cats and don’t want an insanely loud car, I would recommend Borla’s quietest “Touring” muffler in their axle-back kit. It still may be louder than you expect. I might have preferred this option over the cat-back, but we wouldn’t get the increased power from the Borla X-pipe or as much of a weight reduction that the cat-back offers.
Up on the lift, our friends and Mustang experts at RareFab in Boynton Beach, Florida performed the install.
The stock exhaust is made up of three main sections. The front section incorporates an “H” crossover pipe, the middle has a pair of resonators, and the rear has extremely heavy and massive mufflers.
Page 1 – Stock Exhaust & Borla S-Type
Page 2 – Stock Exhaust Analysis
Page 3 – Crossover Pipe Removal vs Borla
Page 4 – Mid Pipe & Muffler Removal vs Borla
Page 5 – Borla Installation
Page 6 – Borla Installed
Page 7 – Dyno Borla & K&N Airbox Lid On vs Off
Page 8 – Dyno JLT vs K&N Intake. New PBD Tune Dyno
Page 9 – Dyno Overlays: Stock, Tuned Stock Intake Manifold, 2016 Mustang, 2018 Mustang, 2012 Boss 302, Conclusion