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.