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Originally Posted by Jason50
It's there, though it can't really be heard over the Big boy exhaust 
In car it is fairly clear and @5PSI it is more of a rasp than a whine.
The KB units start off very quite, but as they run in they do start to make more music.
I think it is actually underdriven spinning around 4500RPM when the motor is up at 6K+. Max rating is around 18,000RPM  : |
Mmm that Big Boy sounds nice combined with the Blower
: thanks for the Vid mate.