The Gt with the bolt ons was, at best, making around 250rwhp. You pulled on him simply because you are making about 30 more rwhp. I had a 01 GT, with bolt ons. Definitely not a world beater, but I did surprise a few LT1 Slomaros.
Bet you didn't surprise any '01 "Slomaros" though, did ya?