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I can buy direct replacement GXP Brembo brakes from GM for a very reasonable price. That would include Calipers, Brake pads and rotors. I was at the track last week and a guy with a GXP had the 18" all season wheels on to drive it to the track. So will the GXP Calipers and rotors fit on my GT? Has anyone tried this?
 

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I have been told (not verified) that the spindles are different enough that the brakes would not just bolt up. I was also under the impression that 18" would not fit over Brembos. Maybe they fit (obviously they fit) but not with what engineers determine to be sufficient clearance.
 

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Good chance fronts will fit fine. Got a dealer friend working on this and he sees no issues fitting to car. Next up will be fitting first candidate.
 

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Do a search on any other G8 board to find many people who have done this upgrade. Quite easy actually...
 
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