Aqua Power Clamp-on Silencers

Aqua Power Ltd Clamp-On Silencers

Our clamp-on silencers quiet harsh noises produced by high horsepower marine engines very well. The most exciting feature is that no power is lost in most installations which makes it an ideal marine racing muffler.

The Clamp-on silencer is a compact and light weight version of our product. High power models are frequently used on 1200 horsepower supercharged engines.

Installation is straight forward: slide it onto the pipe and clamp it in place.

Exhaust systems using through transom tailpipes that dump all the water into the exhaust stream at the very end of the pipe, such as Stellings and CMI, typically have noise reductions that are 3 db greater than the ratings shown.

All models accept an external rubber flaps for additional surge protection.

   
    
     Clamp-on Silencers

    Power      Pipe  Internal   Case     Extension     Noise     Item #
    Range      Size    Flap   Diameter  Aft of Pipe  Reduction

In-tube based
  200-500hp    4.0"     no      4.0"       5.5"        8.8 db    9047-PR

HP500 
  375-525hp    4.0"     no      5.0"       8.1"       11 db      9055-PR

Standard
  500-662hp    4.0"     no      5.5"       8.8"        9.1 db    9049-PR
  500-662hp    4.5"     no      5.5"       9.2"       10.4 db    9051-PR-S
  500-662hp    5.0"     no      5.5"       9.0"       11 db      9053-PR-S

High Power
  662-1075hp   4.0"     no      5.5"       7.6"        6.8 db    9049-75
  662-1075hp   4.5"     no      5.5"       9.2"        9.3 db    9051-75-S
  662-1075hp   5.0"     no      5.5"       8.1"        9.0 db    9053-75-S

Notes: 9055-PR is specifically designed for HP500 engines and is not 
 normally used on other applications. 9055-PR cannot be used with cast
 iron exhaust manifolds.
   For naturally aspirated engines standard mufflers should not be used
 above 650 hp and high power mufflers are limited to 850 hp.
    
   
  

To select a clamp-on silencer for your boat begin by determining your engine power then restrict your selection to the power ranges that include your engine. Next determine the outer diameter of your tail pipes. Determine what type of tail pipes you have, standard or stellings. The outer tube of a standard tail pipe extends to or beyond the inner tube. The inner tube of a stellings tail pipe extends farther back than the outer tube by as much as 3/4". If your boat has a swimboard or other obstructions near the tail pipes you may need to determine if the case diameter (outside diameter of the silencer) will interfer. Also see if the extension length of the silencer is acceptable. If you know the decibel level of your engine with open exhaust you can subtract the noise reduction to determine the approximate final noise level with silencers installed. Adding external rubber flaps sometimes reduces the noise level by another two db. All that is left is to read the part number. Our sales department may be of considerable help in this process.