I have a 2006 Scion xA with a custom cold air intake and a High Flow catalytic converter with a custom downpipe and a 4 inch diameter muffler. I looked into getting a supercharger but was wondering if there is anything else I could do to get more horsepower out of my car. I don't want to go spending $4,000 on a supercharger yet. Anybody know anything else I can do to get more horsepower?
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