hi . owner of a 2005 gto six speed. currently pretty stock.no tune.
NOW- magnaflow cat-back,jba silver ceramic cat4ward headers,jba plug wires,lpe cold air intake,b&m shifter.
harrop diff cover and mount,DSS aluminum drive shaft,jhp sports gauges,jhp gm door lock switch.
SOON-about to install bmr drive shaft loop,bmr subframe connectors,bmr strut tower brace,slp sway bar and bushings, sway bar link bushings,harrop poly cradle bushings,(have parts already)swap out to a billet products shifter.
THIS SUMMER-modified 243 heads,intake and t.b.,slp hd oil pump and timing chain,kooks long tubes with catted mids,pondering a cam  230/230 .591/.595 or
232/236 .600/.600 . hope it hauls ass.