In my research the Web 88a grind seems to be the go to. For MX it seems to be better to use just a Web exhaust cam with a stock intake cam. +1 hp over using both except on the very top. For sustained high RPM like TT racing you can use both for more top end. My plan was to do the one cam, but I ran out of budget and was ready to get my motor back together to ride it so I'm still running stock until the next top end. Web does the cams in sets so you would have to talk them into doing just one for you.