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205 you are indeed correct but that isnt what I said. A drastic change in flow will require appropriate corrections to suit a new free flowing happy state. I guess most would know that. I stand by the fact that you do not need back pressure. I can imagine them at BMW making the latest high efficiency high output engine when someone pipes up "how much back pressure have we got guv". 100mb at 3k ? No zat is not enough lets hammer zee exhaust flat. Someone may well ask how loud is it though. Manifolds are different and can be very technical. But again it isnt back pressure they are trying to generate but vacuum at the correct timings. Only my opinion of course and people are quite welcome to generate as much back pressure as they want.
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