First off.. a GP is not an actual sportscar, sports bra maybe.. Secondly you have the GT, which is not supercharged. So kicked the crap out of a Civic is easy... start from a light or stop and it'll take him long enough to build torque that you'll never see him again.
The 3800 is one of the worlds easiest and most forgiving motors you can work on. Most of these have never had maintenance done and they still drive darn good at high miles. You won't see many Hondas/Toyotas without a long service record that can boast like that. Fawk.. last week I started my car and ran it for a solid minute or two without any oil in the motor. Plug was on the ground next to the oil change bucket. I've driven that same engine another 500 miles since.