RENNtech Stainless Steel Muffler for 231 - SL 550 bmw-3-series--e90-e91---2005-2012--335i-3-0-l-i6-twin-turbo--n54-n55--esr9908178 produce a total weight savings

produce a total weight savings of 8 kg compared with the stock system

User can load their custom setting onto the HSM to set the vehicle to their preffered ride height

With this RENNtech was able to significantly increase the area under the curve

the complete system has a unique sound to complement its substantial increase over a very wide rpm range

ECU Upgrade: Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file

RENNtech Stainless Steel Muffler for 231 - SL 550 bmw-3-series--e90-e91---2005-2012--335i-3-0-l-i6-twin-turbo--n54-n55--esr9908178 produce a total weight savingsRENNtech Stainless Steel Sport Muffler for 231 SL 550. Gaines: +15HP & 20TQ RENNtech stainless steel (SS) sport mufflers are hand made and rigorously tested to remove any unwanted resonances in the cabin to deliver a deep sound that keeps with the character of a luxury performance vehicle. Our mufflers offer incredible sound in a lighter than the stock weight exhaust with improved performance. This is accomplished by reducing exhaust system back