Reset the ecu to have it relearn your fuel curves. wont be perfect but itll help. none of the bolt ons we do force us to need a tune. it helps with gains and of course yiur car will run smoother. without a tune, your car just wont run at full potential but not enough is being changed to cause harm without it.
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R.I.P. 8/01/13 1SlowZ
One day I'll have another....
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