I had my '02 GT (auto) dynoed a while back & came away with 245 hp & 251 tq. I have noticed a lot of other cars with similar hp numbers, but they all have way more torque than mine. What is the deal? A buddy suggested that it may be due to a lack of back pressure since my exhast is pretty wide open(no cats, o/r x-pipe, & flows). What do you guys think?