i have 225/45/18s on my stock gts wheels. they are a little wider but hold the road great! gas mileage is down 2mpg tho on the highway 
worth it for the added traction tho
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RR 08 Evo X GSR w/SSS, Aero, Interior Sport, K&N Drop In, Buschur Crossflow CBE, Goodyear Eagle GTs, Escort 8500, Perrin Shorty
Sold: GG 09 GTS w/ Sun, Sound, Navi
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