Audi RS5 B9 GPF Models - Road+ Cat-Back Exhaust System with Titanium Oval Trims BMW > 4 Series > F82/83 M4 Coupe/Convertible & M4 Competition Coupe�� (Non-OPF equipped models only) > 2014 to 2018 Sound - Engine at Idle:

Sound - Engine at Idle: 71dB (+1dB) - Static 4

independent testing has revealed that the 3” Turbo back upgrade with a re-map produces over a 20% increase in BHP

Letting you be able to add that extra personal touch to your vehicle

perform a free-air calibration if desired as the sensor ages

The M135i is shipped from the factory with a muted exhaust sound leading to a very disappointing driving experience

Audi RS5 B9 GPF Models - Road+ Cat-Back Exhaust System with Titanium Oval Trims BMW > 4 Series > F82/83 M4 Coupe/Convertible & M4 Competition Coupe�� (Non-OPF equipped models only) > 2014 to 2018 Sound - Engine at Idle:Our range of Cat Back systems are perfectly suited to cater for anyone looking to improve their sound and aesthetics, designed as a direct replacement for the original system, available in multiple configurations enabling the owner to choose the increase in volume of their exhaust and or add a more suitably aggressive tone. All our products are made from 304L Aircraft Grade stainless steel. This quality material will ensure that your Cat Back system