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Slip-In Marine Exhaust Silencers

Silencer Test:  With noise legislation becoming a very real issue, noise regulations are increasingly affecting boaters in many parts of the United States.  Here are some popular tests of silencers from leading manufacturers.  The results are comprehensive.  The Slip-In silencers are a top performer in noise reduction and a great value for most applications.  Here are the results:

Test Boat - 25 foot Eliminator Daytona
Engine - 502-ci Chevrolet/Bravo
Exhaust System - Gil Exhaust Manifolds, pipes & through transom exhaust tips.

Silencer Type dBA
@idle
dBA@
3000RPM
dBA
@WOT
RPM
@WOT
Open Exhaust 84 97 103 4700
Hardin Marine Slip-In Silencer (410-284401) 74 84 92 4500
Hardin Marine Silencer Tips (410-282405)
Open Position
Closed Position
82
75
87
85
100
95
4700
4650
Gaffrig Power Tip (725-1302)
Open Position
Closed Position
84
75
96
87
102
94
4700
NA
Hardin Marine HP (410-282409) 76 87 95 4650
Bassett Header Mufflers (410-284402) 78 92 98 4600
Drew Shotgun III's (400-SG4)

82

92 99 4700

Click on the part number to check pricing or place an order.

Exhaust Silencer
Hardin Marine Slip-In Silencers
These silencers are one of the best values on the market today. Their unique louvered design out flows all other imitations with holes. These silencers are constructed from 100% stainless steel and their compact 5" length makes them easy to install in most exhaust tips and water injected headers. Decibel drops of 8 to 10 are commonly seen. Best suited for under 425 horsepower applications.
Part No. Description
410-284401 4" Slip-in Silencers (pair)
Exhaust Silencer
High Performance Silencers
These high performance silencers feature large stainless packed louvered design cores for maximum performance through a muffler system. They are ideal for blown or high compression engines. They are approximately 10" long and slip in a 4" header collector. Best suited for higher horsepower applications.
Part No. Description

410-284402

4" Hi-performance Header Silencers (pair)