Gibson 110003 Bullet Marine Muffler, 4.50" Inlet, Polished Stainless

Compatible Applications

• Marine - designed for large-displacement inboard/sterndrive engines (e.g., 500HP, 502, 525, 525SC, 575) rated up to 1,200HP
• Universal fit for boats using 4.50" exhaust tubing with an OEM-style transom mount

Fitment Notes

• 4.50" clamp-on inlet, 11" overall length
• Sold as a pair
• Meets California SAE J2005 Motorboat Sound Law requirements (under 88db)

Features

• Straight-through design tested up to 1,200HP with minimal or no power loss
• Uses water to dampen exhaust sound, a technique specific to marine muffler applications
• High-quality T304 polished stainless steel construction for corrosion resistance in marine environments
• OEM-style transom mount for straightforward bolt-on installation
• Proven to reduce decibel levels well within and beyond the 88db limit required by California's SAE J2005 Motorboat Sound Law, without sacrificing power
• Backed by a one-year limited warranty

Specifications

• Type: Bullet Marine Muffler, Clamp-On
• Inlet Diameter: 4.50"
• Outlet Diameter: 5.00"
• Overall Length: 11"-15" (case length 12", overall 15" per some listings)
• Material: T304 Polished Stainless Steel
• Finish: Polished

Included Components

• 2x Bullet Marine Mufflers (sold as a pair)

Product Description

The Gibson 110003 Bullet Marine Muffler brings dramatic noise reduction to high-horsepower boats without sacrificing performance, tested to hold up under engines rated as high as 1,200HP. By using water to dampen exhaust sound rather than relying purely on baffling, it's engineered specifically for the demands of large-displacement inboard and sterndrive marine engines.

Owners running loud, straight-piped setups routinely report a dramatic drop in cabin and dockside noise after installation - often described as a fraction of the original volume - while GPS-measured top speed remains unaffected. Built from polished T304 stainless steel with an OEM-style transom mount, this pair of mufflers offers an easy bolt-on path to meeting California's SAE J2005 sound ordinance without giving up the power these big-block marine engines are built to deliver.