This would be a retune on a 2004 chevy impala ss. I was thinking about putting on a smaller pulley for the supercharger?
A retune is 100.00 off , you must be the original owner of the cart at the time it was last tuned by us. We do not retune on someone else's tune and this is provided as a basic bolt on upgrades does not include E85 or changes like speed density tunes.
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