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It doesn't seem to be worth it on a stock car as far as hp is concerned. maybe1-2 hp? Where you can use a tune is with lt's, again dynos have shown 1-2hp only, but one I saw about 5-6? I dont recall the details. But with lts you need it for the cel light and to get the A/F in line. Now if you have a auto trans I understand it really helps on the shift points, firming it up and playing a bit with the VVT.
it may void warranty if dealer works on your car and finds it caused a problem.
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