Have stock 98 GT 5-spd manual. Only engine mods to date are BBK CAI, hotter coils and wires. Have a set of PI heads and Ford Racing intake for a winter project. Plan on larger throttle body and plenum too. Local guy is selling set of older Bassani mid length headers and off road H pipe at a very good price. I've read not to bother with shorty headers, go full length or stay stock, but what about mid length? Worth the effort? Will I need an aftermarket K-frame like full length headers do? Thanks!