Multimedia Exchange - LS1 gone crazy

Can any body help me i have a small problem i`ve installed a MAC headers
TF 4398 on my 2000 trans/am and i`ve lost some hp and power from my car.
My car`s specs:
ls6 intake manifold / asp pulley / SLP cold flow pac / MAC tf-4398 w offroad y pipe / Borla exhaust with stock pipes (the company`s pipes from the y pipe to the borla exhaust and to the tips) / 3.42 richmond drivetrain / hypertech programmer gen 3 / by the way my car is automatic - A4-LS1

I`m greatfull and thankfull for any suggestions > :)

Wrong forum and this will be moved shortly, but I will try to help out a bit.

You should've gained power with headers, but you could be throwing SES codes and your engine is not working to it's full potential now. You should either get your car tuned or get O2 eliminators. Getting your car tuned would be your best bet because you can get a few extra horses out of it :)