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So, who is gonna be a guinea pig on this one?

467 views 9 replies 8 participants last post by  Almuliman  
#1 ·
owns 2000 BMW M5 DUH!
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#7 ·
Dorman, who I trust, sells a tank for a few dollars more. These could be back door specials from the regular run.
Those headers are just single wall copies. They probably fit, but do they add any power?
We need an engineer to tell us how much exhaust gasses slow down as they cool.
BMW spent some effort to build double wall manifolds and pipe for a reason.

I am not a flat earther on headers. Hot Rod magazine have proven numerous times that max performance goes up with each increase in header/ pipe size. Usually up to 2 1/2" header/3"pipe for a performace big block. But there is a drop in low speed V/E or scavange in the torque range.