Without the optional muffler, it's about the same dB but very different sounding. With the optional muffler after the silencer - it's quieter than stock and a BUNCH more power.
$65 expansion muffler
- Thread starter crowvise
- Start date
Without the optional muffler, it's about the same dB but very different sounding. With the optional muffler after the silencer - it's quieter than stock and a BUNCH more power.
Schwinn-Locura
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I got my SBP chamber today. I have it tuned for low end power (getting a smaller rear sprocket soon.
Its amazing, been practising some good wheelies. The torque is right there, and I still gained on the top end. I have some carb adjustments I need to do but its not bad as is.
Also for the sound its a little louder, and a bit more dirtbike-ish I guess I'll say it. Its not over the top obnoxious though.
Its amazing, been practising some good wheelies. The torque is right there, and I still gained on the top end. I have some carb adjustments I need to do but its not bad as is.
Also for the sound its a little louder, and a bit more dirtbike-ish I guess I'll say it. Its not over the top obnoxious though.
Last edited:
chainmaker
Member
I have this exhaust and it kicks it...did You take the time to clean up the exhaust manifold and manifold gasket ??
Cheers
Cheers
Schwinn-Locura
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Yeah I did. Also check your intake, Mine had some casting problems.
I only got to drive it for 1 day then my CDI went for some reason. Waiting on a new one in the mail right now. Also put on my Boost Bottle, and have a carb in the mail.
chainmaker
Member
I cleaned up both with a small hand file took a bit of time ..Im using the stock carb and a 39 tooth sprocket and Its got enough oomph for Me.
Cheers
Cheers
namefail
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i ordered an expansion chamber from Boost Bottle Industries 16 days ago via pay pal. Have no conformation of shipment and no tracking information. Still havent received my item. He ha also been dodging my e-mails. Prolly be out 85 dollars. Avoid this guy
boostbottleindustries.com
*ill update this if i receive my product. still a **** dealer tho
boostbottleindustries.com
*ill update this if i receive my product. still a **** dealer tho
gd925
New Member
regarding the email dodger
I'd prolly dispute that via your bank or paypal and report him to the Federal Trade Comission thats what I did when I got ripped by CopacabanaBikes, don't ever buy from them by the way.
I'd prolly dispute that via your bank or paypal and report him to the Federal Trade Comission thats what I did when I got ripped by CopacabanaBikes, don't ever buy from them by the way.
back2theborstal
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the expansion chamber is the main part. that does little to muffle any noise. it is there to boost the power of the engine. it acts as a power boost because of its shape, when the exhaust gases to through it, some bounces back into the cumbustion chamber. it comes included with a "silencer" which you put on at the end of the expansion chamber. that is what will quiet it down some. then sick bike parts also sells another muffler that can attach to the silencer. so it kinda acts as 2 mufflers if you have both hooked onto the expansion chamber. they say it doesnt effect performance... i have not tried one of these expansion chambers. i am new to motorized bikes. i bought my first kit (sd stinger) in december. and have been having fun riding, fixing and leaning about them. i also work on cars (mostly classic chryslers) so i know a bit about mechanics, and how engines and other systems operate. although for me it is sometimes more fun to ride and fix my motorized bike, because its alot less stressful when something goes wrong...
i havent gotten alot of the after market performance parts yet. i have gotten the billet intake. which seems to make the engine rev alot cleaner. i also got the teflon coated clutch cable. which is AWESOME. also have a set of those dellorto jets for the carb. and i have the pirate cycles hub adapter with a 40 tooth sprocket. i really like that too. because you can actually get your chain tension even and the sprocket straight. plus im sure it makes the rim last alot longer. i also use an after market wire and spark plug. so i havent really gotten into the parts for the engine itself. like the higher compression heads, the expansion chamber exhaust, the dellorto, or cns carbs... havent done the porting to the engine like some people talk about. i will get to all that eventually..
i would imagine that the expansion chambers do help with power. of corse like everything, it will work best after it has been tuned. and once you have the carb jetted perfect, the air flow just right, and the expansion chamber at the right length. im sure you can really fly! if you go on youtube you can watch some videos of people who have the sick bike parts expansion chamber on, and see what it sounds like. i dont think its any louder than the stock exhaust. and it seems to sound a little deeper. and im sure if you have the silencer AND the muffler on it, it would be quieter. its nice to have a quiet engine. but you can usually only get an engine so quiet before it starts to effect performance...
i havent gotten alot of the after market performance parts yet. i have gotten the billet intake. which seems to make the engine rev alot cleaner. i also got the teflon coated clutch cable. which is AWESOME. also have a set of those dellorto jets for the carb. and i have the pirate cycles hub adapter with a 40 tooth sprocket. i really like that too. because you can actually get your chain tension even and the sprocket straight. plus im sure it makes the rim last alot longer. i also use an after market wire and spark plug. so i havent really gotten into the parts for the engine itself. like the higher compression heads, the expansion chamber exhaust, the dellorto, or cns carbs... havent done the porting to the engine like some people talk about. i will get to all that eventually..
i would imagine that the expansion chambers do help with power. of corse like everything, it will work best after it has been tuned. and once you have the carb jetted perfect, the air flow just right, and the expansion chamber at the right length. im sure you can really fly! if you go on youtube you can watch some videos of people who have the sick bike parts expansion chamber on, and see what it sounds like. i dont think its any louder than the stock exhaust. and it seems to sound a little deeper. and im sure if you have the silencer AND the muffler on it, it would be quieter. its nice to have a quiet engine. but you can usually only get an engine so quiet before it starts to effect performance...
