Big Block 525 Merc EFI/700 Replacement Exhaust System (Standard Exit)   

Stainless Marine has been building quality marine exhaust systems for a number of years. So when theneed arose for a manifold option or solution for the popular Mercury racing 525/600 and 700 EFI enginesthey were right on top of it. Stainless marine has designed an exhaust pattern machining fixturethat when attached to the factory cylinder head will allow boring, drilling, machining and tapping of auxiliaryexhaust system attachment holes. These new holes will allow attachment of one of their traditional H/Pmanifold systems. Exhaust exits are designed for standard Bravo exit locations.

Note: Machining of Cylinder Heads is required to use these manifolds. A machining fixture is available for rent to facilitate this.

Big Block GM H/P Long Riser Kit

This system was designed for mildly modified factory engine packages. It shares the same features as the systems listed above, except its long tailpipe discharges water later in the exhaust stream. This provides some flexibility for mild cam shaft changes. Please consult us for cam shaft compatibility.

Big Block GM Hi-Torque Captains Call With Switchable Exhaust Riser compatibility

This kit comes with the same features as the standard kit, except that it has a riser designed to accommodate boats equipped with a switchable exhaust diverter. This is a remarkably easy installation and comes with all brackets and necessary hardware.

Industry wide, Stainless Marine exhaust systems are recognized for increased horsepower, remarkable weight savings, an exclusive five-year warranty and an incredible value.

Tests by both Hot Boat and Trailer Boat Magazines revealed increases of 3.2 to 6.5 MPH on MerCruiser Big Block powered 22'-24' boats.

The unique construction results in the heaviest manifold weighing only 23 pounds A huge savings compared to cast iron Stainless Marine is one of the top quality and least expensive systems available today. Note: All systems based on Bravo applications.

Big Block GM Hi-Torque Dry System

This system is designed for heavily modified engines with large cam shafts and/or high compression It will deliver maximum horsepower and reliability on naturally aspirated engines Keep in mind, all dry systems are very loud

Big Block GM Hi-Torque Standard Kit

The Hi-Torque manifolds feature state of the art design with a single wall internal casting that is enclosed in a press formed aluminum jacket creating a fully water cooled manifold. A highly polished stainless steel riser comes standard as well as bolts, gaskets and fittings. This system is also covered with an exclusive 5 year warranty.

Industry wide, Stainless Marine exhaust systems are recognized for increased horsepower, remarkable weight savings, an exclusive five-year warranty and an incredible value.

Tests by both Hot Boat and Trailer Boat Magazines revealed increases of 3.2 to 6.5 MPH on MerCruiser Big Block powered 22'-24' boats.

The unique construction results in the heaviest manifold weighing only 23 pounds A huge savings compared to cast iron Stainless Marine is one of the top quality and least expensive systems available today. Note: All systems based on Bravo applications.

Stainless Marine Hi-Torque Gen III - Big Block GM, 4-1/2" Tailpipe, Up To 540 Cubic Inches And Over

These systems are incredible performers They holdboth APBA catamaran and V-bottom records This systemhas recorded speeds in excess of 160 MPH and isdesigned for the person looking for true header performancewith reliability of a manifold system This system isdesigned for large cubic inch and supercharged motors.

Industry wide, Stainless Marine exhaust systems are recognized for increased horsepower,remarkable weight savings, an exclusive five-year warranty and an incredible value.

Tests by both HotBoat and Trailer Boat Magazines revealed increases of 3.2 to 6.5 MPH on MerCruiserBig Blockpowered 22'-24' boats.

The unique construction results in the heaviest manifold weighing only 23 pounds.A huge savings compared to cast iron. Stainless Marine is one of the top quality and leastexpensive systems available today. Note: All systems based on Bravo applications.

Stainless Marine Hi-Torque Gen III - Big Block GM, 5" Tailpipe, Up To 600 Cubic Inches And Over

These systems are incredible performers They holdboth APBA catamaran and V-bottom records This systemhas recorded speeds in excess of 160 MPH and isdesigned for the person looking for true header performancewith reliability of a manifold system This system isdesigned for large cubic inch and supercharged motors.

Industry wide, Stainless Marine exhaust systems are recognized for increased horsepower,remarkable weight savings, an exclusive five-year warranty and an incredible value.

Tests by both HotBoat and Trailer Boat Magazines revealed increases of 3.2 to 6.5 MPH on MerCruiserBig Blockpowered 22'-24' boats.

 The unique construction results in the heaviest manifold weighing only 23 pounds.A huge savings compared to cast iron. Stainless Marine is one of the top quality and leastexpensive systems available today. Note: All systems based on Bravo applications.

Hi-Torque Replacement Big Block Manifolds Only (pair)

Set of replacement manifolds only. No pipes. If you find yourself in need of maintenance accessories - we've got them!Gaskets, Clamps, Manifolds, Sealers.  We've got it all!