Matt has been messing with billet reed cages and also an E-Tec style powervalve for the 85-86 as well. Matt's only issue is that he is a one man show, and there is a hell of a waiting line. I'm not sure if he has any pipes available right now either. There are a few mods to be done on the 85-86 frame to make it accept the 87+ engine. You can also change the uppers shock mounts to accept the 87+ shocks. If you want to wait, get ahold of Matt at the link posted by BadMoon, if you want immediate change, get the FMF.