The Greddy EVO TT (Turbo Tuned) exhaust catback is an upgrade version of the famous EVO2 design. Greddy adds flame treated titanium tips and larger 70mm piping to create one of the highest flowing, and best sounding exhausts that we have ever heard. The EVO-TT exhaust is designed to be used on RX-8's with forced induction (goes great with the Greddy turbo kit) to offer higher flow, a deep sound, and incredible fit and finish. The EVO-TT exhaust is a direct bolt on, and requires no modifications to fit on your 04-08 RX-8.