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Why is a tune required with header/hi-flow cat installation?
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04-21-2016, 06:56 PM
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RS Speedriver
Drives: 2018 camaro 1ss 1LE
Join Date: Apr 2013
Location: B.C. Pitt Meadows
Posts: 305
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you need a tune. just when u go service it, put it back to stock. simple. or just dont mod your car period.
RS Speedriver
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