There's really nothing free. Your best bet if you want a decent gain is a CAI and Tuner combo. Then I would get 3.73's or 4.10's to get some off the line performance.
2007 V6 Mustang
I've had my '07 automatic V6 Mustang for about a month now. So far, I've added a Flowmaster exhaust kit. But I was wondering if there are any free things I can do to make my car faster. Any info would be great.
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