I'm wondering about the setup of the RB Road Race header. In the pic, the two pipes just terminate into thin air (no collector I think its called?). Do you need to hook this up to a true dual or something or can it go onto the RB presilencer?
Is just dumping two parallel flows of exhuast into a large cylinder going to improve exhuast flow?

Thanks,
Nima

 

You can hook it up to a true dual or you can buy the RB collector.