os vz-r version 2 on road pipe ?
 

does anyone have any comments on what pipe works bets on this engine ?

its to go with a mugen mrx-4 on a high speed track

thanks

OS VZ-R VII
 

You can get good performance from any of them. If you are looking for top speed, get a shorter pipe/header combo. I have used the RD Pipe becasue they are cheap and they work fine. I have used the RB too, and didnt really notice much difference.