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Header x pipe no tune
Will a 2010 2ss L99 run ok, with a cai, bored throttle body and 2" headers high flow cats and x pipe with out a tune? My Dad finely put his car back to stock and said the tune is no good b/c was only 14.1 miles to gallon and now back over 21, with just cai on the car. He wants to ad the other parts but wants to run it with out the tune other then going to the track.
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