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Specify 4 inch, 4 1/2 inch, or 5 inch - The Best Switchable Exhaust System on The Market! - Police Tested on 502 CID 600 HP Engine Using a SAE Standard Approved Decibel Meter @ 85 DB - NO HORSEPOWER LOSS! (Copy of Report Available) - Lets You go from Quiet Marina Operation to the Spine Tingling Roar of the Through Transom Exhaust That You Love so Much - Sleek Styling will Enhance any Boat's Appearance - Dash Mounted Switch Activates the Air Cylinders which Open and Close the Muffler Flaps - Clamp-On Kit (3 pr) - Note: Keeping Flaps in the Closed Position will Help Prevent Water Reversion - Kit Includes: Mufflers Air Cylinders Pump Hose Fittings and Switch
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