I honestly see nothing that the poo poo pipe offers over a stock pipe, actually I think a stock pipe with a couple simple mods will probably out perform the poo poo pipe because the longer the pipe is the more restrictive it is, and overly restrictive pipes kill these little engines in my experience, hill climbing power is gonna suffer big time with a pipe that doesn't allow the engine to breathe well, I have a gutted out stock kit pipe on one of my bikes just for experimental purposed for a short time, it has NO catalytic junk in it and I cut the little stinger tube off and just drilled out where it was to enlarge the hole, that alone made a huge difference in hill climbing power and my top speed is good on that bike, it has 24" wheels and I run a 30T rear sprocket on the 24" wheel so my speed on top is 40+ mph and it still pulls the 24" wheel good for my area, in a very hilly area like SF I'd be running a 36T on the 24" wheel probably and a 41T or 44T on a 26" wheel probably.I personally think the torque I I is a good idea these kits need all the bottom end available I mean they don't have enough to star from a stand still outta the box plus I live in sf which has the steepest hills this is just opinion though I had a raw motor on a springer fork shcwinn in Virginia and 44 th was more then enough torque easily hit 35 but regardless what do you senior members think of thishttp://www.kingsmotorbikes.com/Motocross-Poo-Poo-Pipe-Muffler.html I know kings is not SBP but it seems interesting.
yep this one for sure. fun and usable.lowaus, here is a pic of the pipe I am running on one of my bikes, I cut about 4"/10cm off of inlet pipe and I'm using flex pipe of about 30cm/12" from engine exhaust flange to the expansion pipe.
This pipe is doing a better job than any of the others I have tried so far, other set ups did good for low and mid power but were lacking on the top end, but this set up is giving me good power all the way around and I did not loose top end speed, this bike currently moves me down the road at 69+kph/43+mph
It has some port work, a ramped piston and a well tuned carb, the lower assembly has preety nice balance also, no harsh vibes at any RPM from start to wide open, that make a big difference also.
MaP
Yep this is the best of the small pocket bike pipes I've seen, got one on my heavy 26" cruiser and with my 215lbs on it I cruise right along at 43-44mph with a 34 or 36T on the rear wheel.yep this one for sure. fun and usable.