I think it is a 52605, like I said long day. But the inline pipe is the way to go on the V1R(R) I find. Well here is my theory.
The front of most pipes (all except my very short Eagle racing pipe) sit right next to the front 27/25 tooth pulley. If you take a decent side hit the pipe gets forced inwards and downwards if you have a rear exhaust engine. The front of the pipe hits the pulley (evidence by most of my old pipes having a pulley shaped indent) but the rear can continue inwards. This seems to force the pipe out of the coupler if you get unlucky. I got unlucky 3/4 races one night!!
I did not have any problems with my RB header and RB X12 pipe however, the pipe did not come out of the coupler. But it did get messed up pretty bad on the inside where it hit my chassis