The front bank tube was unchanged, hence the repeat of 393 cfm. The rear bank used to flow 17% less than the front bank due to the ugly kink, but now it is within 3% flow.
Yes - I am surprised that MSDS puts such a HP robbing kink in the Y-pipe, especially since the point of buying headers is to reduce backpressure. I suspect that this is worse that the production Y-pipe (at least for the rear bank.
