Ok, gents, does adding a performance exhaust boost gas mileage, all things being equal?

Yes, in general, it spends less HP pushing burnt gas out. On internal combustion engines, it is a known factor that if the engine breaths easier, it will boost HP and MPG.

Good Luck...

If you take advantage of better airflow and re-jet the carbs or install a power commander to remap the fuel injection, no, I don't think you will. if you carefully adjust the fuel delivery, you MAY improve the gas mileage

Most emission controlled engines are tuned to run very lean, which gets the most mileage out of an engine, under most circumstances. If you have engine surges,and the like, you may do some good. You are better off tuning the transmission rollers, to keep you operating in the fat part of the power band, to get better mileage. If you don't rejet, it just sounds cool. (Malaguti is a big company in Europe that makes both pipes and tanny rollers. Ask them, but remember they want to sell you something)

it depends on the design of the exhaust, and how well it is purpose matched to the timing of your scooter. IE you can design an exhaust for max power or max economy, or somewhere between, but then less of both. Most exhausts are a compromise, even in racing, (except drag!) Noise is also a consideration. Inlet timing, and shapes & sizes are V important too. If a 2st, seriously consider re-tuning your main jet size. You wouldn't want to hole or seize the piston, would you?

I just don't understand you people!

Why do you go to the trouble and waste ur money replacing an existing exhaust pipe when there was nothing wrong with the old pipe?

You think just because the exhaust makes more noise that that gives you better performance?

YOU'RE WRONG !

That bike was engineered, and dyno'ed and tuned and tested with the stock exhaust to get the maximum performance .

I like my bikes quiet, the more quiet they are, the better, I want to hear my engine so if there is an engine problem, I will know.

Adding a performance exhaust has a minimal effect on fuel mileage. If in fact you do see a difference it most likely means that you are finely tuned in to your riding skills, such as acceleration, braking etc.

simply yes it can and not only will it give you (Mpg) it will increase your performance slightly, more gasses out lets more oxygen in so the engine can breath better ...

enjoy.

complicated situation. search in yahoo or google. that will could actually help!