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GM parts catalog says 20mm front and 43mm rear, but that might be currently incorrect.
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1998 Pontiac Grand Prix - 11.24 @ 121
2009.5 G8 GT (Liquid Red)
GXP fascia conversion, GXP diffuser
2009 GXP M6 (MSM) #405 586rwhp/495tq
TVS2300, CTS-V Fuel System, Cam 222/230 116 lsa, Monster Lever 4 Clutch, American Racing 1 7/8 headers, rear Brembo's w/working Parking brake
11.91 @ 119
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