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I might be buying a ste of Hooper Drag pipes, I guess they have adjustable back pressure? I cannot find any inof on them. Does anybody know anything about these? Thanks
 

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Adjustable back pressure means there is some sort of movable restrictor in the stingers.

More BP = More power, but holds in more heat. There is a very small window on what "works" as far as back pressure.

I have messed with 1/8" thick spacers behind the cylinder flanges, sifferent thickness exhaust donuts, etc... to change the signal and back pressure of a pipe. Small changes can make a big difference. Ask Hooper, they are a very good builder and can give the best insight.
 
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