ive got 17s on my 1.4rt and lowered 35mm, front and rear. i had to angle grind of the inner lip of the arch at the rear, cut the front, rear inner parts of the bumper, and remove the rear splash guard, but other than havin any more than 2 people in the back, it doesnt rub what so ever. it does make it better on the front if u have got 16v arches but there not compulsory, im prob gonna get them cause means u can lower it more.