Exhaust Back Pressure and Flow Velocity

[mudnut]

Thanks to the spammer bumping this post, this is a significant lesson here. TD42 guys wondering about kettling should read this.

I just read though the table, Plassy, and it works out pretty well spot on. When I had the RB30 dynoed after the rebuild, we dropped the exhaust after the headers and we got no change at all. Good to know the math works.