SBP Expansion Chamber Exhaust Pipe

PikeHook

PikeHook

New Member
I was just wondering if anyone is running this exhaust..What kind of power increase people are getting with it and where in the power curve it seems to help the most...I was think when this first came out there was a tunable pipe I use to run on my trx 250r..The expansion chamber was in 2 pieces and slipped inside each other so you could change the size of it to tune it for your needs...more low end or more top end..It's pretty straight forward..I can't see why it wouldn't work for all of us who like to tinker with these little engines..
 
Download the installation instructions and read through the second section. It details tuning the pipe. That should answer most of your questions.

As far as performance gains our testers reported between a 3 and 5 mph increase in top speed. They also showed a huge gain in acceleration.
 
I would concur with ghost. It's probably the second best upgrade I've done. I gained about 3mph top end "kept my pipe long" but noticed a significant low end increase. Before I needed to pedal up to about 5mph so the engine wouldn't bog on my 50cc, it's down to around 3mph now. I can actually take off from a stop, but prefer to pedal up a little. Acceleration is much quicker. I don't think the pipe is much loader then the stock, but it has a much more noticeable sound. It just sounds more like a 2 stroke bike now, so it attracts more attention. The stock muffler I always thought people turn to look because they wonder why that lawn mower is getting closer. :D
 
Mines coming any day now! I just love the brown truck when it comes . In this case its the post man just as good!!!
 
goat herder said:
In this case its the post man just as good!!!
Click to expand...

I think postman's had it with me. For a few weeks I was getting something every 2-3 days, last package they just left leaning against my fence instead bringing it too the door. I can't really blame him though.
 
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