Audi S4/S5 B9 Non Sport Diff models - Resonated (Quieter) Cat-Back Exhaust System with Quad GT-90 Polished Trims Seat / Cupra > Ibiza > FR 1.8 20VT (Formula Racing) > 2004 to 2008 the exhaust valve opens allowing

the exhaust valve opens allowing exhaust gases to be split between the rear silencer and a rear silencer by-pass

The default valve operating ranges will be lowered to allow for the valve to open sooner than the standard settings

Example of MK6 VW Golf GT 2

so is made from Titanium

Audi S4/S5 B9 Non Sport Diff models - Resonated (Quieter) Cat-Back Exhaust System with Quad GT-90 Polished Trims Seat / Cupra > Ibiza > FR 1.8 20VT (Formula Racing) > 2004 to 2008 the exhaust valve opens allowingOur 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