A bi-turbo is a performance exhaust. Costa about 100$.
Like 4 bolts to install, you'll need to buy a new kickstand too. (The center mounted gets in the way of the pipe.
It's a HUGE pipe, when you see it on the moped-- chrome, with gold baffle on the end.
I have a lot of gear on my ped, (stereo, air horns, prototype rear defense system).
I saw my targa go from the shy side of thirty to "buried" on slight downhills. That's got to be like 45 or 50.
on level ground, I think it will hit 40-45. That's with a LOT of gear, and I'm not exactly light. I figure between me and my gear it's about 250 pounds. I betcha some skinny kid with no gear would hit 50 easy.
I was told that I wouldn't need to upgrade the carb, because my bike was so new (2000 targa). I read in this forum that not upgrading the Carb could seize the piston due to too little oil flow. (Comments from the experts on Biturbo/Carb upgrade/piston lube, please!!) I'm not sure how you can determine if you'll need one or not.
There are lots of other ways, like jacking it up to 80cc, upgrading the carb, fine tuning....
I've had great service from Mark's Mopeds.