I doubt it... the engine on the P5 is different that those being used on the Mz3s... However, I believe that AEM and some other manufacturers have intakes for the Mz6 2.3l that'll be probably be adapted for the Mx3 engine layout.
Do you know how much an improvement those modifications give the engine? I know the injen intake had a 22hp increase, but I believe that was for the Mz6s (V6)...
normally just around 5-10 hp, with headers, hi-flow cat, and bigger pipes from the cat back, and intake, you should get around 20-25, all crank though, little of that goes to the wheels
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