350x brake upgrade?

[bugler30]

so I posted over on the classifieds section a few minutes ago looking for a bracket for my 350x. I got to wondering if anyone has converted over to use a newer style caliper like off of a 450r or something and whats involved with it, I'd imagine I'd have to make a custom bracket and such. Haven't really looked to closely at a 450r caliper but it looks pretty similar to the 350x one overall. Would it be more beneficial to go with the rear caliper off a 250r or something else with dual pistons instead of single?

[SWIGIN]

Yes, my buddy upgraded his hybrid 250x rear brakes which is similar to a 350x. He used a 86-89 250R bracket then used a newer YZF 400-450 front caliper. You will also need a 250R 0r a 450R disc and disc hub.

Here is a link to the YZ caliper upgrade, it is smaller and works as good or better then a NEW 250R caliper.
http://www.3wheelerworld.com/showthread.php?65919-250r-rear-brake-mod&highlight=