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Just totally cut apart my stock muffler and rebuilt it after owning it a month. It's way better than stock. I have a 2014 w a BBK and big carb (how I got it). I drilled holes in the muffler and that helped... But loud and annoying. Now I cut it all apart, gutted the muffler, ported the head pipe, and ran straight 1in drilled pipe through a shortened muffler w steel wool and glass packing... Way deeper, quieter sound and way better flow. Loud isn't always fast.... If u got 6hrs and a welder, a grinder, a drill press, and an undying desire to hot rod anything u touch.... It's "easy" haha. But mine looks stock, down to the new inner fender mount and trimmed heat shield.

I just bought my 2014 agility 50 a month ago. It had the 80 BBK and big carb, and derestricted stuff done. Ive never ridden a stock 50cc until today (a newer agility) mine is WAY BETTER. I just added a new belt (off a gy6 150 I got) and added weight to my sliders, now 10gr. Can go 40 easy on flats and still pulls up hill good. I am going to stick the 150 engine in as soon as it's built up. The dementions of the agility 125 are the same.... Motor mounts will be a total custom weld up job as the mounts are on top of the case on the gy6. But it looks pretty easy.... If you have a few years of fab and welding experience and equipment. I'll be constructing a jig and some other fixtures to built my mount w soon. But for the performance and cost, and easy install... The BBK is really great.