I have never liked the stock exhaust that comes with the kits and this speed demon bolts right up and your done. Still in break in mode, so I can't say anything about performance. I can say I like the way it sounds.

This absolutely decreases my current performance by 40%

It works great it also fit perfectly

Better than stock but don't look for a big change.

Speed demon muffler is good. Gotta modify the silencer if you want it to run correctly. If you donmt too much back pressure will result.

For what it is... an inexpensive bolt-on upgrade for your stock exhaust ... it's great. Do NOT expect massive increases in top-end or even bottom-end and you won't be disappointed. What do you think a sub $30 bolt-on exhaust is going to do for you? What it DOES do is (a) Makes your bike sound a little nicer... you get the pops... you get actually sound like a little motor now... without being exceptional obnoxious. (b) You will notice a small boost at the bottom-end... yes, torque did increase for me... slightly... but noticeable. (c) You will notice that you likely didn't gain any extra speed... or if you did, it was minimal. This really isn't the exhaust you want if you are a "SPEED-DEMON" (ironic, huh). This is a perfect exhaust for the guy looking to increase the sound and lower end performance of their bikes a little... with a simple 2-nut swap. No other mounting necessary.

Cristian was very helpful and courteous on the phone when I had questions about my return.

I love this muffler it's giving me horse more horsepower more acceleration and more top end speed it's smooth out the vibration and it's a lot quieter than it was before I love this muffler it's the best and also looks really cool highly recommend replacing your stock little Chrome muffler with this you will be happy

I chopped it off at the end to make a non muffled banana pipe. Way more power. Way too noisy now, but I'd rather ppl hear me. It's safer.

I cut this pipe at the bend to re-orient it for my 50cc engine. On this engine power really kicked in from 7,000-10,000 RPM. It has a nice motorcycle-like idle and sounds much less like a weed-whacker. Good value, only downside is I noticed the internal pipes connecting to the expansion chamber have some nasty burrs from when they were cut and assembled. The manufacturer should take the extra 10 seconds to de-burr the pipes.

Love BikeBerry.com. Easy ordering, great product, great pricing plus orders arrive quicker than expected. Thank Bike Berry

FIT PERFECT AND DOES HELP LOW AND MID RANGE PERFORMANCE

The expansion chamber exhaust definitely eliminated the majority of the jerkiness that I was getting from my engine. It also added quite a bit of torque so my bike accelerates better. It installed just as easy as the stock muffler.

Sweet Love the sound and it adds abit of pickup to help haul me along nicely

No regrets I didn't get the speed increase I was expecting, but I definitely noticed a serious boost to my acceleration.

Excellent upgrade This is just about the best upgrade I have done. Sounds much better while staying moderately quiet. Improved throttle response and mid-range power.

LIGHTWEIGHT This pipe is lightweight but may need to be bent to fit to

Works well Works well just for the priceI would expect more out of this Exhaust Muffler. Better to stick with the original exhaust andmodify.

Good Investment This pipe does what it's supposed to for sure! I have one big hill on the way to work that I had to pedal up to keep the engine running before. Now with the new pipe installed, I can maintain almost 20mph up the same hill. No real noticeable difference in sound, but it looks decent and gets the job done. Overall this is a nice little upgrade.

amazing very nice muffler

GREAT MID-RANGE POWER Bought and installed this about a month ago. Finally got to ride to work (7 miles one way).Definitely the pipe is tuned to increases the low to mid range performance.On a couple of hills that use to be pedal assist - the bike slowed to about 15mph and maintained that speed without pedalling.I could not tell if the top end performance was changed.Others have claimed a loss of top end performance. If true, I would rather have a pipe tuned for low to mid range over top end.

Meh. Haven't noticed any speed increase at all- the name's a little miss-leading. At least my bike doesn't sound like a weed whacker anymore. (C) Shipping/delivery. (A+)Looks a lot better than the original. (B)

Worth Every Penny If you want a great increase in low end performance get this muffler. You WILL notice the difference right away. This was the biggest performance gain that I noticed out of all the aftermarket parts I installed.