What are the best exhaust headers I am able to use for my 01 mustang gt( automatic) that will give me max. performance ( horsepower and tourqe)?

 

Hooker and Kooks,as far as I know are the only long tube headers that will allow transmission removal (or even fit an auto trans).Bassani headers are "mid-length",the collectors come out beside the transmission.I would avoid shorties.The gains are smaller than long tubes or mid-length and installation is about the same.A real PITA.