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Re: tune a must after full exhaust install??
Sandbagging is letting off the gas while down the track. Either to fake a time or to not break out.
What year car???
Most likely you will be rich with a full exhaust set-up. 10-15 RWHP can be gained from a good dyno tune after bolt-ons. Depends on if you feel 10-15 RWHP is worth $500.
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1999 Pontiac Trans Am WS.6 #1747
Stock'ish'
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