Part No.: G4-00197
RACING MEGAPHONE MUFFLER Chrome for SR400/500 ('78-'08) - GOODS ESPECIALLY
¥28,600 JPY
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GOODS original design "MEGAPHONE MUFFLER" SR400 slip-on kit
GOODS ESPECIALLY
SR slip-on muffler "MEGAPHONE" series
GOODS original megaphone silencer made of steel with a chrome-plated finish.
A wide lineup of end caps, from the classic trumpet type to the racy open end.
Developed in-house, this product uses a single expansion chamber + glass wool sound-absorbing design for a structure that resists deterioration over time.
GOODS DESIGN
GOODS original design
A GOODS original design based on the UNIVERSAL mufflers of the past.
We offer a wide lineup, from the classic trumpet type to the racy open end
Highly durable.
GOODS's original sound-absorbing design
Conventional imported universal mufflers, such as reverse cone mufflers, use a thick straight perforated core with wool, so many lose their silencing ability quickly,
but this product, developed in-house, uses a single expansion chamber + glass wool sound-absorbing design.
Because it relies less on the wool, the structure resists deterioration over time.
*The wool can easily be repacked with our Glass Wool (Part No. G4-00093) 、Stainless Wool (Part No. G4-00092) products
Just the right volume.
Single expansion chamber + glass wool structure
Conventional universal mufflers often have a wool-only straight-through design that silences poorly when the throttle is snapped open and tends to be very loud,
whereas our original "MEGAPHONE" uses an expansion chamber + a restricted straight path to deliver strong silencing even when the throttle is snapped open.
We also refined the shape and structure of the end cap to reduce wind noise and the harsh tone of conventional products.
*Without the optional silencing baffle
*Measured on an SR400
1200rpm:87.4db
3500rpm:98.7db
An optional dedicated baffle is also available
For riders who want it even quieter, we also offer an additional silencing baffle dedicated to the MEGAPHONE series.
Easy to install: just remove the end cap and secure it with one bolt.
*Measured on an SR400
1200rpm:82.4db
3500rpm:92.0db
Size
[Silencer body]Length: approx. 412mm
Max diameter: approx. 94mm
Inlet diameter: φ45.3mm
[Joint]
Overall length: 160mm
φ45mm straight section: 120mm
Exhaust pipe side inner diameter: φ41.3mm
Silencer side outer diameter: φ45mm
Material
SteelContents
Silencer x1End x1
Joint x1
Bracket x1
Band x2
Fitment
SR400/500(78-'08')Sound level (reference)
*Measured on an SR4001200rpm:87.4db
3500rpm:98.7db
*With optional baffle installed
1200rpm:82.4db
3500rpm:92.0db
Please note
*Racing use only, not for use on public roadsFAQ
Q Can it be made even quieter with the separately sold baffle installed?
A
Exhaust exits the pipe through passage 1, returns inside through passage 2, and then flows to the rear end where the wool and baffle are.
Green circle: Passage 1 Blue line: Partition Red circle: Passage 2
You can make it quieter by blocking holes in passages 1 and 2 to reduce the open area.
The easy way is to wrap metal tape around it a few times, but you could also weld them shut or, if your tools can reach, use bolts and nuts.
*Blocking too much will noticeably reduce power,
so if you block them, we recommend up to about 30% of each passage.
*Passage 1 has 32 holes and passage 2 has 28 holes.
Exhaust exits the pipe through passage 1, returns inside through passage 2, and then flows to the rear end where the wool and baffle are.
Green circle: Passage 1 Blue line: Partition Red circle: Passage 2
You can make it quieter by blocking holes in passages 1 and 2 to reduce the open area.
The easy way is to wrap metal tape around it a few times, but you could also weld them shut or, if your tools can reach, use bolts and nuts.
*Blocking too much will noticeably reduce power,
so if you block them, we recommend up to about 30% of each passage.
*Passage 1 has 32 holes and passage 2 has 28 holes.
