Back-pressure pipes?

[imdying]

Some of the aftermarket 4 valve Ducati exhaust systems are pretty neat... they're sectioned up into heaps of different sized pipes, with tapers at various points.

At a guess you jet up because when you increase the scavenging effect, you increase the volumetric efficiency of the motor, which means more air, requiring more fuel?

[deanohit]

At a guess you jet up because when you increase the scavenging effect, you increase the volumetric efficiency of the motor, which means more air, requiring more fuel?

I think your right there mate.I know on the over muffled dirt bikes today,by putting a freer flowing exaust with fewer baffles on,you are increaseing the amount of air your engine can process.There fore you need more fuel flowing to reach the full potential of the engine an often a performance air filter, it all helps, with some bikes gaining more than 5hp.Hope y'all can sort of under stand this.

Dunno if I can make head or tail of it meself

Edit:Try sucking through a straw, then a vacum cleaner pipe. Thats what it will be like for you engine.

[rudolph]

My frind had a 750 Magna with 4 Cobys on it

[The Lone Rider]

Everyones missed one important thing, other then performance. The new pipes look and sound kinda cool even if they are loud :P Last post was to say yeah, you'll get pinged for it though and have to pay $$ whenever you get caught.