Single Bravo Sterndrive Extension Box Kit

The Mayfair standoff box kit is the most advanced, easy to install, state of the art system on the market today. The torsional drive shaft helps cushion the shock to the outdrive when shifting in and out of gear. Mayfairs’ torsional driveshaft and the Mercruiser high performance coupler are designed to absorb shock to the Bravo outdrive. All Mayfair extension boxes are manufactured from 356 T-6 cast aluminum, CNC machined for accuracy, and then hard anodized for supreme corrosion resistance.

This kit includes:

• Extension Standoff Box
• Backing Plate
• Rear Engine Mount Pads
• Extended Bravo Drive Line
• Extension Box Mounting Hardware

NOTE: When running a standoff box, you must use a twin ram full power steering system.

Single Bravo Sterndrive Extension Box Kit

The Mayfair standoff box kit is the most advanced, easy to install, state of the art system on the market today. The torsional drive shaft helps cushion the shock to the outdrive when shifting in and out of gear. Mayfairs’ torsional driveshaft and the Mercruiser high performance coupler are designed to absorb shock to the Bravo outdrive. All Mayfair extension boxes are manufactured from 356 T-6 cast aluminum, CNC machined for accuracy, and then hard anodized for supreme corrosion resistance.

This kit includes:

• Extension Standoff Boxes
• Backing Plates
• Rear Engine Mount Pads
• Extended Bravo Drive Linse
• Extension Box Mounting Hardware
• Dual Cylinder Mayfair Add-On Hydraulic Steering Kit

NOTE: When running a standoff box, you must use a twin ram full power steering system.

Dual (Twin) Bravo Sterndrive Extension Box Kit

The Mayfair standoff box kit is the most advanced, easy to install, state of the art system on the market today. The torsional drive shaft helps cushion the shock to the outdrive when shifting in and out of gear. Mayfairs’ torsional driveshaft and the Mercruiser high performance coupler are designed to absorb shock to the Bravo outdrive. All Mayfair extension boxes are manufactured from 356 T-6 cast aluminum, CNC machined for accuracy, and then hard anodized for supreme corrosion resistance.

This kit includes:

• Extension Standoff Box
• Backing Plate
• Rear Engine Mount Pads
• Extended Bravo Drive Line
• Extension Box Mounting Hardware

NOTE: When running a standoff box, you must use a twin ram full power steering system.

Dual (Twin) Bravo Sterndrive Extension Box Kit

The Mayfair standoff box kit is the most advanced, easy to install, state of the art system on the market today. The torsional drive shaft helps cushion the shock to the outdrive when shifting in and out of gear. Mayfairs’ torsional driveshaft and the Mercruiser high performance coupler are designed to absorb shock to the Bravo outdrive. All Mayfair extension boxes are manufactured from 356 T-6 cast aluminum, CNC machined for accuracy, and then hard anodized for supreme corrosion resistance.

This kit includes:

• Extension Standoff Boxes
• Backing Plates
• Rear Engine Mount Pads
• Extended Bravo Drive Linse
• Extension Box Mounting Hardware
• Dual Cylinder Mayfair Add-On Hydraulic Steering Kit

NOTE: When running a standoff box, you must use a twin ram full power steering system.

IMCO Standard Height Extension Box Only

This is the most advanced, easy to install, state of the art standard box on the market today. The torsional drive shaft helps cushion the shock to the outdrive when shifting in and out of gear, and on and off throttle operations. Inferior designed competitor's boxes use a drive shaft that is solid mounted to the flywheel, doing away with your coupler. Their units literally hammer the internal components in your drive, which rapidly accelerates failure.

IMCO's torsional driveshaft and the stock MerCruiser rubber coupler are designed to absorb shock resulting from extreme high performance applications and rough water conditions.

356 T-6 cast aluminum transom motor mount brackets available for both neutral and 3"lift extension boxes.

Lightweight super strong cast 356 T-6 aluminum extension boxes, available in 12" neutral set-back or 12" set-back with 3" lift.

356 T-6 aluminum side mount steering brackets allows ample mounting clearance for optimum K-Plane placement - clears most exhaust ports, swim brackets, etc. - keeps rams on pivot center line.

IMCO Standard Height Extension Box with Torsional Drive Line Neutral

This is the most advanced, easy to install, state of the art standard box on the market today. The torsional drive shaft helps cushion the shock to the outdrive when shifting in and out of gear, and on and off throttle operations. Inferior designed competitor's boxes use a drive shaft that is solid mounted to the flywheel, doing away with your coupler. Their units literally hammer the internal components in your drive, which rapidly accelerates failure.

IMCO's torsional driveshaft and the stock MerCruiser rubber coupler are designed to absorb shock resulting from extreme high performance applications and rough water conditions.

356 T-6 cast aluminum transom motor mount brackets available for both neutral and 3"lift extension boxes.

Lightweight super strong cast 356 T-6 aluminum extension boxes, available in 12" neutral set-back or 12" set-back with 3" lift.

356 T-6 aluminum side mount steering brackets allows ample mounting clearance for optimum K-Plane placement - clears most exhaust ports, swim brackets, etc. - keeps rams on pivot center line.

IMCO 3" Higher Extension Box with Torsional Drive Line and 3" Raised Inner Transom Assembly

This is the most advanced, easy to install, state of the art standard box on the market today. The torsional drive shaft helps cushion the shock to the outdrive when shifting in and out of gear, and on and off throttle operations. Inferior designed competitor's boxes use a drive shaft that is solid mounted to the flywheel, doing away with your coupler. Their units literally hammer the internal components in your drive, which rapidly accelerates failure.

IMCO's torsional driveshaft and the stock MerCruiser rubber coupler are designed to absorb shock resulting from extreme high performance applications and rough water conditions.

356 T-6 cast aluminum transom motor mount brackets available for both neutral and 3"lift extension boxes.

Lightweight super strong cast 356 T-6 aluminum extension boxes, available in 12" neutral set-back or 12" set-back with 3" lift.

356 T-6 aluminum side mount steering brackets allows ample mounting clearance for optimum K-Plane placement - clears most exhaust ports, swim brackets, etc. - keeps rams on pivot center line.

Ram Bracket Left

Ram Bracket Right

ITS Extension Spacer Kit

Introducing the latest addition to the accomplished list of Zeiger Performance Marine products. After installing the ITS extension spacer plate the test boat accelerated quicker, was more stable running at top end speed, and had a better angle of attack while spanning the waves. It was more predictable while negotiating a turn and above all else it was 5 MPH faster. The test boat normally ran at 94-96 MPH with the standard ITS sterndrive mounted on the transom of the boat and after we installed the 5” set back box and increased the pitch of the propeller the test boat ran 102 MPH.

Kit Includes:

• Mounting Studs
• Spacer Bolt Kit (allows you to raise ‘x’ up 1”-2”)
• Heavy Duty Extended Drive Shaft
• Water Transfer Hose Kit
• New Longer replacement steering and trim hoses
• Gasket Kit

Offshore Race Upgrade Kit for Mayfair Extension Boxes

The upgrade kit is recommended only for all out race applications with high horsepower engines. This kit will come with a billet bearing carrier, a power take off for the crankshaft and a splined flange to connect the Bravo drive and drive shaft assembly together.

NOTE: This is not recommended for pleasure boats.