Here is the set up..70cc "Airsal" kit 50cc hi hi head 15mm Bing 83 jet and this pipe...your good. A metric ton of low end, and pulls allllll the way to 45 depending on gearing. Massive about of torque as well. Had the same setup with a boss pipe, much less low-end and loss of torque.
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Best stock puch pipe
March 26, 2019
taco eater :
Graham Motzing from Eau Claire, WI United States
If you're looking for a pipe for a stock cylinder puch this is the one to get. Best low end and midrange and still pulls well in the higher rpm. 42-43 from this setup with a stock cylinder and 15 bing, switching to a boss gets the same bike to 46 but total bummer mid range.
The new one - clear coat- is a major downgrade. The old black one had great paint and an indestructable circlip mounted silencer. This one uses two bolts and a goofy arrangement that is not as secure. Be sure to use loctite and don't over-tighten them.
Sucks they changed it, was a 5 star, now its only 4.
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Good pipe
September 22, 2018
taco eater :
Ed
Very loud. Definitely need earplugs when riding. Maybe I can rig up something to replace the glass pack muffler it comes with. Welds on the muffler holder are good, must have been updated since that previous review. Make sure to tighten those nuts down tight, maybe 10 ft-lbs. Loctite maybe. I had 2 nuts vibrate off, and the can was dangling. And without the can, this thing is machine gun loud. Oh, and it seems to give tons of mid-range power. My 70cc bike wheelies now.
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Good Pipe... till the baffle snaps off.
June 6, 2017
taco eater :
Kackman from Duluth, MN United States
This baffle is way to heavy for the cheap metals and welds on this pipe. Vibration from normal use, and the baffle clean broke off within two weeks of use... but who needs the baffle anyway. Loud pipes save lives. Just know, your baffle will not last.
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Magnum
July 19, 2015
taco eater :
Anonymous Person from Santa rosa, CA United States
This does not fit on magnum unless the old exhaust is cut and welded onto new setup. However once does sounds good.
Budget build?? This is your pipe!! 
Best stock puch pipe 
Good Pipe... till the baffle snaps off. 
Magnum