Open exhaust Hp gain?

No thats a good question.The car isnt certified for that speed.I have a jacket and just whats required to run in the 10.60 class that i was shooting for.But im not interested in running in the 9's just yet.Im just so close im curious if i can get there with minimal tuning.Once i get that time slip im going to back off and run the class i was shooting for.Its honestly for curiousity and im not going to lie,a little bragging rights for a few of my chevy friends.I was thinking that being it wasnt tuned when i took it to the track,we were all expecting it to be somewhere in the mid to high 10's.When it broke into the low 10's without touching it,the game was on to see if it could run 2/10th's faster.Thanks for the input.It was running a little rich corked up,so i was hoping dropping the exhaust would show some gains.Like i said,if nothing else it weighs a ton.I'll let you know what happens.