We have to remember that the Peugeot 908 V12 had side exit exhaust and so did the Porsche RS Spyder, Acura ARX-02 and the Acrua/HPD ARX-01c. I know that's years ago, but it didn't seem to harm those vehicles performance.
Not to mention that the Pug had particle filters and the Porsche and Acura/HPD cars mentioned had mufflers in the sidepods. I'd think that a bigger issue would be heat from the exhaust messing with tire pressures
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