you are just about right on the money from your seat of the pants 1/4 timer. Our cars, with a good driver usually run between a 13.1-13.3 at 105-107 MPH. There are a few mutants out there that have run a 12.99-13.0 bone stock, but those are rare. GTOs are no problem, hell WS6s, SS, Automatic Vettes and just about every Mustang that isn't blown will also fall victim and never know what hit them. Ain't it FUN!!!