Alright fellas, you're flooding this guys thread, lets take it to PM. Um Mainstream Performace is located in Powder Springs. The way I would go is take I20 to Thorton Road and go down to Bankhead and after passing through BankHead take a right at the second redlight, go two more redlights and take a left, go one more redlight and take a left and start looking because mainstream is hard to see, hiding behind the Corvette shop.