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Super Trapp Quiet Muffler Selection Guide

quiet mufflers Posted in Small Engines

For exhaust silencing, you must use the optional resonator.

Use the 3s Models if space is limited. The 5s models are the quietest when equipped with the optional resonators. Three types of 5s resonators are available, 4", 5" tri-tube and 6" tri-tube. With the 6" tri-tube being the quietest. This is a retro-fit muffler that can be used on most gas, diesel and 2 cycle engines. Many engines have an exhaust port that is threaded with National Pipe Threads (NPT). It is just a matter of removing your existing muffler and inspecting the exhaust port. The threaded (npt) models listed on the 3s and 5s pages can be screwed into those engines. Please note that all the available information on these mufflers is contained on our web pages. This is a retro-fit muffler, we can not offer any further suggestions in the application or use of these mufflers than what is listed on our web pages.

Engine Size
Exhaust Silencing Requirements
Silencing
at minimum cost
Maximum Silencing
in unlimited space
Maximum Silencing
in limited space
If used as
the only muffler
Adding on to Existing Muffler
Diameter Limited
Length Limited
2-8 HP
2S
3S + Resonator 3S If space permits, use largest diameter model available for given inlet size. Always use the optional Resonator. Always use the largest diameter model available for given inlet size. Always use the optional Resonator if space permits.
8-10 HP
3S
3S + Resonator 3S
10-40 HP
3S
5S + Resonator 5S
40-100 HP
5S
5S + Resonator 5S

Specifications

Model
FLOW RATING*
at 1 psi
back pressure
Number of disks required
VS.
Engine Size
Inlet Sizes available
Diameter
D
Length
(approximate)
Width
(approximate)
T
Threaded
C
Clamp-On
Ls
Standard Configuration
Lr
With optional Resonator
Standard Configuration
With optional Resonator
2S
up to
45 CFM
1 disk
per 1 HP
1/2" & 3/4" *NPT
Not
Available
2"
3 1/2" to 4"
Not
Available
6 to 10 oz.
Not
Available
3S
up to
250 cfm
1 disk
per 3 HP
1/2" to 2" *NPT
3/4 to 2 3/8" dia.
3"
4" to 5"
6 1/2" to
7 1/2"
3/4 to 1 1/4lbs.
1 1/4 to 2 lbs.
5S
up to
1050 cfm
1 disk
per 7 HP
1" to 2" *NPT
1 5/16" to 3" dia.
5"
4 1/4" to 7 1/2"
8" to
11 1/2"
1 1/2 to 4lbs.
3 1/2 to 6 lbs.
*NPT = The inside diameter of the pipe. 3/4" NPT pipe measure 1" outside diameter. 1" NPT pipe measures 1 1/4" outside diameter.

How it Compares

Exhaust Noise Level, dba
(Measured 20" and 45~ from outlet. Subtract 25 dba for approx. noise at 50'.)