400ex suspention

Yes and no :D
A 400/450 rear shock is a very popular mod. However there is a ton of geometry involved in the rest. It’s definitely not a simple bolt on. One of the biggest factor I’ve learned is what’s called frame rake.
Member Phragle had a custom blaster that used the complete geometry/arms. He won the Baja 1000 with it.
Member Blaner did a how to putting YFZ 450 arms on a blaster