225/45r17?...actually for his car,since it came with 205/55r16's...215/45r17's are fine....205/40' might actually be a smaller diameter then his 205/55r16's...which depending on the percentage(less than 2% is ok) might throw off some calibrations

"Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but STUPID lasts forever."-Aristophanes. --93 pgt,headers,intake,borla=14.9 1/4mile