My experience with the Aero Racing Plus 4 SS exhaust that was fitted to my car (pre GDI) before I took delivery was very much a mixed bag. In the end I learned that both the quality and the size of the catalytic converter supplied was insufficient. I now have a larger 300 cell cat using a high quality core. It has rectified the emissions problem with particular reference to an exhaust smell that was starting to come into the cockpit when the hood was down as well as possible MOT inspection problems, and it has deepened and subdued the exhaust note a little. It stiil roars if I am heavy on the loud pedal but at cruise it is much more pleasant. A little bonus was increased mid range performance.

Peter

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