Open exhaust Hp gain?

Seeing what the consensus is on open exhaust.Im going back to the track next week,and would like to pull my exhaust for some et gain.Last time at the track the duster ran a [email protected] was with a full TTI exhaust,3 inch with an x pipe,magnaflow muffs and the rest of the exhaust over the axle and out to tips at the bumper.My question is in my quest for a 9 second time slip would pulling the exhaust give me some more hp?I know that just in weight alone it would have to be good for something,as it weighs a ton.Last time at the track it was 105 degrees,with a 4900 foot elevation.Everyone noticed a 2/10 increase in their et over their normal times from the humidity.Usually the track is @ a 1500-2000 foot elevation.Weather is supposed to be much better this time.Its possible my car might have ran in the 10 teens in better air,so im trying to find every little increase of horsepower.Would it be worth it?