The Firebird is coming back???
To answer you original question, the GTO and the GXP are totally different. GTO is a Holden based rear wheel drive two-door coupe with the 5.7 litre pushrod engine, the GXP is a front wheel drive four-door sedan with the 4.4 Liter Northstar engine (overhead cams). Both have different engines, trannies, chassies, interiors, exhausts--totally different.
Also, the F body was designed by engineers in the U.*.--the GTO/Monaro was designed in the land down under (not European). They share the same engine block, but thats about it. Even the exhaust was developed specifically for the GTO.
Retired Moderator, The Bonneville Club www.bonnevilleclub.com
RIP Oldsmobile, April 29
1995 Bonneville SE Supercharged (Stock)
Current Mods: Dirty GYM Sock air freshener.