Quote:
Originally Posted by jchammond
I would wager to say,,,that if your bolt-on's added 15whp; then a tune would net another 15-or close to it...Factory tuning is rich (very low 12's AFR) and on a N/A Z-they are tuned closer to 13:1AFR
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Don't forget the other perks like throttle response and if ecutek then the added performance traction control.