CP Performance Boaters Shopping and Product Info Guide
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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 |
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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.
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| Exhaust Silencer High Performance Silencers |
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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.
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