Originally Posted by mark electric
Inside HI-COMPESSION MUFFLER.
Do the extra holes mean more flow?
I'm not sure I understand back pressure?
Thanks from Mark

Thanks for the photo Mark, good stuff! cool

I guess the best way to describe back pressure is to do a little experiment: take a deep breath, close your mouth, close one nostril and breath out as fast as you can. Then repeat with your mouth and both nostrils open..... a self evident answer to both your questions grin (and make sure the bushmans blow doesn't make a mess)

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