Fourtitude have fitted a Milltek Sport non-resonated cat-back with exhaust valves to their own Audi RS 4 B7 V8 and said:
I'm running your development DP and a resonated system, the system has been completely faultless since day one and offers just the right blend of performance gains and refinement to make the car perfect for both daily use & quiet cruising. It also offers a great sound upon hard acceleration for my Stage 2+ car and exceptional performance for a 2.0T.
"On the highway, sport mode is absolutely amazing; words can't accurately replicate or describe the sound. We couldn't be more pleased with the performance, look, and sound of the Milltek valved cat-back exhaust system on our RS 4."You can read more in our 'Milltek in the Press' section or view the article, including dyno tests and photos, in full on the Fourtitude website.