Conversation Between 5 Star Tuning and Rennwyll

New coupon code out for the year. Use 5star at checkout for discounts on any nonsale item on the site.

Mike, is there a "coupon" or anything for being in the group? I am looking for an x4 for a 2001 6.8l Ex. Just looking for a better throttle response (hate the lag), and maybe something to help with towing. I am in the midwest and all we have is 87,89,93 octanes with 10% ethanol. I mostly run 87 cuz my wallet aint that deep...lol