Porsche 997 C4S dynos before and after exhaust, headers, and custom OE Tuning tune, +18.4 AWHP
The vehicle here used in the baseline is a stock motor 997 C4S on 91 octane. It does have 19 inch HRE wheels and lowering springs. The car was dyno'd first without any changes and then the AWE-Tuning exhaust and headers were added. After that, OE Tuning did their custom dyno tune. The car gained 18.4 whp from the baseline. Remember, these gains are at all 4 wheels on a dyno dynamics dyno in case you are wondering why a Carrera 4S is not putting out more. It is also a tiptronic transmission which you can see shift in the dyno and the trans does suck a bit of power.