I was thinking about putting a K&N CAI & Steeda underdrive pulley system on my 03 Mach 1. But I heard that these upgrades are pointless for the Mach 1 mustangs. Can anyone shed some light on the situation before I spend $500 on parts I may not need.
Hell go 4.30s with the 4V, those puppies love it way up in the RPM range.
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