The pipe is the run of the mill pocket bike pipe off of E-Bay w/ a little cutting/welding required. I just bought 2 for $33 w/shipping (the first one was $21 w/shipping, the second one only added about $12). Of course, I had to re-jet the bike because the pipe flows a lot more. I think I finally got it jetted right this afternoon (clip in third slot from the top w/3 washers under it). Seems to run really well now and the plug looks good, although it's a little loud. Pulls pretty good when it comes on the pipe. I like this bike a lot more than the Schwinn, less vibration, smoother ride and faster cruise speed. This Grubee motor runs and idles great. I can see riding this bike the 13 miles to work if I had to. Currently have about 15 miles on it, so far so good (lots of Lok-Tite). I bought this motor from someone on E-bay (was a good deal) while I was waiting for my King motor to show up. After inspecting both motors, I decided to use this one. The King motor is obviously a lower quality unit (back-lash on the gear reduction unit is pathetic sloppy with only about half tooth engagement, what the heck is with that? and the castings are more than crude, bummer). Not sure if I'm even going to use it, might just sell it to be rid of it. I hope the rest of you guys have better luck with the quality of your King motors. I personally, based on what I've seen, would not recommend the King motor if you're willing to spend a few bucks more for a better quality motor. The Schwinn chopper has a Tiger motor that is very similar to the Grubee and so far seems to be running well. There are real differences between motors from different vendors from what I've seen.