Milltek, maker of some of the finest performance exhaust systems in the business, released new kits for the BMW 135i  E82 Coupe and E87 Cabriolet. They have developed two systems to fit both the older models powered by the N54 twin-turbo engine, and the newer N55 single scroll models.

The systems are customizable, which means you can choose what parts you want. You can select between primary and secondary cat back options, and different tailpipes: Polished Stainless or Ceramic Black Dual GT-80.

The sound and power gain depends on the setup, but Milltek says a full turbo back system on a mapped 135i can gain as much as 30 brake horsepower which is quite remarkable. As for the sound, they promise a crisp and throat noise without any unwanted drone or resonance.

Prices start at £741.