I have stock front disc and rear drum brakes on my '87 GN and they suck! I am looking at upgrading to the new PST rear disc brake upgrade kit that sells for about $450. Does anybody have any experience with them? I'm trying not to spend $1200 for the Baer setup. Also, is there a good inexpensive front upgrade kit available that will fit in the stock GN wheel? Any help or advice would be greatly appreciated.