How about I'm not talking about the tuner, ass, I'm talking about the hours I spent explaining to you about mods and what to do/not do with the car.
I also don't give two fucks what the dyno says, these cars make power to AT LEAST 6000 RPMs if running right. So either:
Something is wrong with the dyno (not)
Your car is fucked up (more likely)
So instead of spending money on shit you didn't need, try fixing the car first.
FYI, my "1998 auto LS1" went 13.24@106.5 bone stock with nothing done to it and 2.73s. Swapping to 3.73s it went 12.96@108.5.
No lid, no cat-back, no DRs, nothing. Your car has an issue that needs addressed.
So again, before asking everyone on here or LS1Tech, take my advice or don't, but put the fucking thing on an eddy-current dyno and scan for knock or false knock. Change the plugs, change the wires, check everything.
But don't you fucking dare call my ass out after the help I gave you and jump my shit.
BTW, 5500 shift points are dumb as shit. This isn't a big block.