Will the header off a beta2 fit on the beta1? I found a header for sale but its for the gk tiburon and I have an rd2.

 

Fitment is a tricky subject. Even if the bolt holes line up, the rest of the pipe may not go, because it hits the engine, the fans, the oil pan, or whatever. That is to say "I don't know, but don't be surprised if you get conflicting answers and/or it won't fit"

$0.02