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Re: putting on horsepower won't work until you reflash you pcm and put it on a dyno?Read!
They were refering to a prom chip. There is some code you need for these to add HP and torque. If you add a cold air intake, the IAC will read a sufficient increase in air flow, sending that info to the ECM thus increasing power. Same should be for a less restrictive aftermarket exhaust system.
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