RENNtech | Stainless Steel Muffler | R231 | SL 63/65 AMG mclaren-600-lt-esr8962987 Entire cartridge is fine balanced

Entire cartridge is fine balanced as an assembly

Our performance package includes our proprietary ECU tune in addition to our full carbon fiber airbox for a gain of +19 HP and +38 TQ over stock

Audi RS4 (B7)

Power kW  266

745 HP +97 HP 767 LB-FT +54 LB-FT X167 - AMG GLS 63 R1 Package 773 HP +112 HP 788 LB-FT +75 LB-FT X167 - AMG GLS 63 R3 Package 875 HP +227 HP 873 LB-FT +160 LB-FT

RENNtech | Stainless Steel Muffler | R231 | SL 63/65 AMG mclaren-600-lt-esr8962987 Entire cartridge is fine balancedRENNtech Stainless Steeel Sport Muffler for 231 SL 63 65 AMG. Gains: Up to 10HP & 15TQ 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