I am thinking about a pipe for my 2005 People 50, looked around a lot yesterday, and concluded Tecnigas Next-R to be a good choice. I think that is what I already have on my 2003 Super 9 LC and it works great. I know the CVT was modified some, but not how. The previous owner took it to the local scooter shop, doesn't know what they did, "it just takes off better", which it does.
CVT on my S9 seems to be sensitive to throttle imput. It you give it WOT at start, the rpms will really ramp up and it will hit the pipe and launch. I usually don't want to launch (don't want to wear out my stuff), so I baby it a little to get going, then give it the gas once the clutch is locked up. Then it builds rpms and hits the pipe with the clutch locked up and pulls really nice. Has a great sound too. At 1st I thought it was too loud, but I am used to it now, and really like it.
My son-n-law got a 2011 Super 8 150 that I ride with. I usually follow him, and have no trouble staying up with him. If you follow someone, you usually have to go a little faster to keep up from time to time. His take off is a little faster than mine, but I don't mine cause I can easily catch him.
If you anticipate hills, and gain a little speed as you approach it will climb right up the hill just fine. If you let it get bogged down, you are dead until you can clear it. The 150 powers up the hill on problem, but we both like the Super 9 compared to the Super 8 150. At this point I wouldn't trade my Super 9 for Super 8 150.
Great fun! Cheers