the g8 is a fully austrailian car. only american thing is the pontiac badge
You're missing the point there chrome buddy.Um the motor and trans is all American, plus the GXP uses Brembo brakes
and just becasue it came from Australia doesn't mean there's not any American parts.
The GTO front calipers are the same as C6 calipers.
and judging by he pics and specs of the stock G8 calipers. The calipers might be close to the same as the Grand Prix GXP, but of course will need the Grand Prix brackets