You don't have to have 20's to clear the Brembo's. Hell, Bogart and Weld make 17" wheels that will clear them. Our stock 19's will not clear them without spacers though, and our tires are about an inch shorter than the Camaro.
'09 PSM G8 GT w/ Premium & Sport packages.
Go: Kooks 1 7/8" LTs, Corsa, VCM OTRCAI, Rick Crawford's AirRam intake and ported TB, SLP UDP. 12.64 @ 113.5, 1.99 60'
Whoa!: CTS-V/ Camaro 4-piston Brembos, Hawk pads, DBA rotors, some bushings.
Show: 4300K HIDs, LED fogs, VG Sharkfin, GXP diffuser, 10% tint, debadged, Eibach drop springs, polished CTS-V wheels.