Quote:
Originally Posted by b92
Front & rear bumpers won't increase the area under your wheel arches, unless you also have M3 fenders installed. Pics would help, super easy to upload to imgur and post the link here.
Since you have an XI, you will need to make sure your front & rear rolling diameters are within 3% of each other. The sizes you listed will be fine (647.1mm vs 641.6mm, 0.86% difference).
Assuming you are running the stock 18" tire sizes (225/40 and 255/35), you will only be increasing your rolling diameter by 1-1.5%, so your speedometer will read 1-1.5% slower which is negligible (100mph will read as 99mph..)
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I will take photos and upload this weekend, I am at school so I can't right now. My stock wheels are 17x8 square with 225/45R17 sized tires. The speedometer thing seems okay then!