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    Boost Bottle and Expansion Chamber Part Review

    A quick look at why these two part go great together!

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    Speed Demon Performance Muffler

    Engine part specialist Jonny shows you how the Speed Demon Performance Muffler performs

Performance Speed-Demon Muffler with Expansion Chamber Item# SD-MUFFLER-EC

OUR PRICE: $29.95
List Price: $79.95

Availability: In stock


Motorized Bike Kit Performance Exhaust Muffler Upgrade with Expansion Chamber is compatible with any 2-stroke 49cc/66cc/80cc Bicycle Engine Kit. Replaces stock muffler with same bolt on pattern requires no modification. This performance muffler has a built in expansion chamber and shorter muffler allowing for better flow and engine performance.

*Note* This muffler does not come with a gasket or specific mounting hardware. However, your existing gasket and mounting screws should be sufficient to optimally run this muffler.

Gasoline operated products are NOT compliant with Environmental Protection Agency ( E.P.A. ) or California Air Resources Board (C.A.R.B) for the use on/off Public roads. Upon purchase, the buyer agrees to use products for racing (closed-course competition) only and NOT for on/off public roads.

Best Price Guarantee

BikeBerry.com is committed to providing our customers with the best price available online! At BikeBerry.com we work hard to offer the most competitive pricing available, but if you find a lower price online, let us know and we'll match it! In fact, if you find a lower price within 30 days of your original purchase date, we'll refund you the difference.

Complete the Best Price Guarantee form below to request a quote or price difference refund.

Best Price Guarantee Terms and Conditions:

Item must be the identical model from an authorized U.S. dealer. Specifically, the product must have the same U.S. manufacturer's warranty, model number, and contain the same components. BikeBerry.com will price match only in-stock products.

BikeBerry.com reserves the right to verify another online company's product availability and price before issuing a price match.

BikeBerry.com does not match auction websites or refurbished products.

The Best Price Guarantee does not apply to obvious pricing errors or clearance/close-out items.

Best Price Guarantee applies to the total purchase price of the item. Total purchase price includes shipping, taxes, or other discounts.

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Customer Reviews

Speed Demon High Performance Muffler Review by Buzz Bomb Pilot
I own a 49cc and an 80cc motor. The Speed Demon Performance Muffler has been a Godsend. It made a difference. My 49cc is set up for speed. Sadly, the 49cc is no longer in service. I am building an 80cc and am putting the muffler on my 80cc. Cant wait to see what happens with my new motor. Well worth the investment. (Posted on 5/23/2018)
Meh. Review by TBM
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) (Posted on 9/20/2013)

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