Quote:
Originally Posted by freebeard
I figured out why Imgur wasn't showing my pix, so here's this
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I'd love to hear that Beetle!
Andyman:
I think a trumpet shaped exhaust reduces pressure on any car:
As the pipe size increases, the flow must slow down to fill that larger volume, so when the exhaust 'gets out' it's no longer trying to 'spray' ambient air out of the way.
Also, as you brake your car you are 'thrown forward' leaving a 'vacuum' behind you...Similarly for the exhaust.
One still sees (normally restricted) trumpets on older bikes sometimes.
The restriction is due to the fact that the trumpet works like a trumpet for noise!
