I already had the uprated BMC on mine, and I bought the HiSpec UL4 from a club member, so it was a straight forward fit. I think the hoses differ from standard however, but I can't remember whether I bought these with the callipers or made something custom from Think Automotive. TBH I don't think the stopping power is very different from the standard callipers with 1144 pads, but I was attracted to the unsprung weight saving of nearly 2kg each side I think. I didn't touch the rears, and the balance seems fine to me for road use, but I rarely drive it hard enough on the brakes to notice if the balance isn't quite spot on. A word of caution though if your considering placing an order direct with HiSpec - they do seemingly have a reputation of being hard work to deal with, with reports of poor customer service. Maybe things have changed, but its something be mindful of.