CPE BMW 135i Cat Back Exhaust System
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The stock exhaust system on the BMW 135i leaves a lot of room for improvement. It does a good job at suppressing exhaust noise, but also corks what is otherwise a wonderful sound. We improved upon the factory system by enlarging the mid-pipes by approximately 0.25" to accommodate increased turbocharger duty. The single resonator cross-over is replaced with our optional dual 8-inch hybrid mufflers, or you can option out these mufflers for the least restriction possible.
The large rear muffler is swapped out for our new muffler which is internally similar to the one used on our 335i cat back, but it was specifically designed for the 135&s single inlet/dual outlet design This new muffler has been lengthened and a small baffle was added to increase noise suppression.
The resulting sound is nothing short of intoxicating, and we would be surprised if your stereo gets much use after installation. The low-rpm range now has a warm and mellow tone without sounding too "boomy." As you move further into the powerband the character changes from a baritone grunt into a frenetic roar. Our exhaust is a dramatic improvement over the flat uninspiring tone produced by the stock setup. It gives the 135i a more aggressive character without becoming overwhelming. Most importantly, there is no drone! We believe that it provides the perfect blend of performance, sound, and appearance, without any of the drawbacks from which most aftermarket exhausts typically suffer.
The cat back comes in two pieces that are modular. You can chose to only replace the rear section, which includes the rear muffler and tailpipes. Or opt to replace only the front section, which includes the larger diameter mid pipes and optional 8-inch hybrid mufflers. No matter which options you choose, the cp-e 135i exhaust is a 100% bolt-in system that requires no cutting, grinding, or welding. Welcome to the product of serious engineering.