M3's Are Soooo Bad......
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Who knows why. I have raced both the M and Mach in stock trim. I did pull more on the Mach up top though. I think one reason is because the M intake may be less restrictive then the Mach's allowing it to breath better and pull on the top end. The 4.6 DOHC heads need alot of air and the stock Mach intake isnt all that good.



