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Extension Boxes


Extension Boxes

Get your drive back and up for increased top end performance and ultra high X-Dimensions with Teague Custom Marine's extension boxes for Mercury Racing SSM and NXT transoms, and IMCO extension boxes for XR and SCX setups.



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  1. $2,484.25
    Extension Box Kit Black SKU: IMC EB-12-N-B
    Manufacturer: IMCO
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  2. $2,484.25
    Extension Box Kit Silver SKU: IMC EB-12-N-S
    Manufacturer: IMCO
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  1. ENGINES
  2. INTERNAL ENGINE PARTS
    1. Engine Blocks
    2. Crankshafts
    3. Connecting Rods
      1. Manley Pro Series Connecting Rods
      2. Carrillo Pro-H Rods
      3. GM Connecting Rods
    4. Billet Roller Camshafts
    5. Roller Lifters
    6. Valve Springs/ Retainers / Keepers
    7. Rocker Arms / Girdles / Guide Plates
    8. Valves / Valve Seals
    9. Timing Chains / Belt Drives
    10. Pushrods
      1. Trend 3/8" Pushrods .080 wall
      2. Trend 3/8" Pushrods .135 wall
      3. Manley 3/8" Pushrods
    11. Engine Bearings
    12. Pistons / Rings / Wrist Pins
      1. Rings / Wrist Pins
      2. Pistons
    13. Harmonic Dampers / Balancers
    14. Cylinder Heads / Fastener Kits
      1. Cylinder Head Fasteners
        1. ARP High Peformance Series
        2. ARP Professional Series
      2. Cylinder Heads
    15. Intake Manifolds
    16. Freeze Plugs
  3. ENGINE ACCESSORIES
    1. Engine Accessory Pulleys
    2. Accessory Brackets
    3. Oil Pans / Oil Pumps
      1. Oil Pumps / Drive Rods / Restrictors / Pick ups
      2. Generation 4 / World / Dart Pans
      3. Generation 5 / 6 / GM Pans
    4. Valve Covers
    5. Oil Filter Adapters / Remote Filter Mounts
    6. Timing Chain Covers / Pointers
    7. Engine Mounts
  4. ACCESSORIES
    1. Anchors / Lines
      1. Anchors
      2. Anchor Line and Hardware
    2. Bilge Pumps / Blowers
      1. Bilge Pumps
      2. Turbo In-Line Bilge Blower
    3. Cleats
    4. Trailer Hitches
    5. Bilge Drains
    6. Hatch Actuators
      1. TCM Electric Hatch Actuator
      2. Hatch Actuator Brackets
    7. Trailer Accessories
      1. Buddy Bearing
  5. APPAREL / GIFTS
    1. Teague Hats
    2. Mens Apparel
    3. Ladies Apparel
      1. Ladies Bling Rhinestone Apparel
      2. Tee Shirts, Tanks and Dresses
    4. Kids Apparel
    5. Jackets / Sweatshirts
    6. Gifts & Accessories
    7. SALE Apparel
    8. Apparel Mystery Boxes
  6. BELTS
    1. Engine Accessory Belts
    2. Serpentine Blower Belts
    3. 8MM Blower Belts
  7. Cables
    1. 43BC Cables
    2. 33C Cables
    3. Mercruiser Cables
  8. Decals / Stickers
  9. ELECTRICAL
    1. Harnesses
    2. Fuses and Breakers
    3. Marine Ignition Switches
    4. Sensors / Senders / Switches
    5. Dash Switches / Military Toggles
      1. Military Toggles Switches
      2. Toggle Switches
      3. Rocker Switches
      4. Cole Hersee Push-Pull Switches
      5. Push Button Momentary Switch
    6. High Torque Starters
    7. Alternators
    8. Batteries
      1. Optima Extreme Power Batteries
      2. Odyssey Extreme Batteries
      3. Interstate Deep Cycle / Cranking Batteries
    9. Battery Switches
  10. EXHAUST / MUFFLERS
    1. Exhaust Systems
      1. Manifold Exhaust Systems
        1. IMCO Thumper Power Exhaust Manif
        2. IMCO Powerflow Plus Exhaust Syst
        3. IMCO Powerflow Exhausts
      2. Header Exhaust Systems
        1. CMI Elbow Top (E-Top) Headers
        2. CMI Sport Tube Headers
        3. CMI Big Tube Headers
    2. Header Accessories / Tailpipes
      1. Exhaust Tailpipe Clamp Kits
      2. Water Distribution Hoses / Clamps / Tubes
      3. Header Gaskets
      4. CMI Header Tailpipes
        1. CMI Transom Tip Tailpipes
        2. CMI Thru-Hull Tailpipes
    3. Manifold Accessories / Risers
      1. Accessory Relocation Brackets
      2. Exhaust Manifold Risers
      3. Exhaust Manifold Gaskets
    4. Exhaust Mufflers & Tips
      1. TCM ST-450 Switchable Exhaust Mufflers
      2. Gibson Performance Mufflers / Turn Downs
      3. IMCO Sound Choice & Mufflers
      4. CMI Mufflers / Sound Choice System
      5. Muffler Rebuild Kits / Parts
      6. Exhaust Tips / Tip Baffle Inserts
      7. North Star Mufflers
    5. Exhaust Accessories
      1. Transom Exhaust Tail Seals and SS Ring Kits
      2. Exhaust Flappers / SS Block Off Plates
  11. FILTERS / MOUNTS
    1. Fuel / Water Separating Filters
    2. Mercury OEM Filters
    3. Inline / High Pressure Fuel Filters
    4. Fuel Filter Mounts
    5. Oil Filters
    6. Oil Filter Adapters / Mounts
    7. Power Steering Filters
    8. Mercury Outboard Maintenance Kits
  12. FUEL SYSTEMS
    1. Carburetors / Rebuild Parts
      1. Carburetors
      2. Carburetor Rebuild Kits / Adapters / Spacers
        1. Carburetor Stud Kit
        2. Carburetor Adapters and Spacers
        3. Carburetor Accessories
          1. Needle & Seat Assemblies
            1. Viton Inlet Needles
            2. Adjustable Needle and Seat Hardw
          2. Pump Conversion Kit
          3. Linkage Kits
            1. SS 4500 Dom Linkage
          4. Carburetor Power Valve
            1. Holley Carburetor Power Valves
            2. Holley Jets
        4. Carburetor Gaskets & Rebuild Kits
          1. Carburetor Gaskets
          2. Rebuild kits
        5. Carburetor Throttle Linkage
    2. Fuel Pumps
      1. Mechanical Fuel Pumps
      2. Electric Fuel Pumps
    3. Fuel Pressure Regulators
    4. Fuel Manifolds
    5. Fuel Valves
    6. Fuel Filter Mounts / Filters
    7. Fuel Hose / Hard Lines
    8. Air Cleaners / Flame Arrestors / Scoops
      1. Stainless Steel Flame Arrestors
      2. Aluminum / Fiberglass Scoops
    9. Injection Systems
  13. FLYWHEELS / COUPLERS / DRIVEPLATES
  14. GASKETS / SEALS
    1. Exhaust Gaskets
    2. Carburetor
    3. Supercharger / Intercooler
    4. Stern Drive / Transmission
    5. Heat Exchanger / Oil Cooler
    6. Intake Manifold Gaskets
    7. Oil Pan Gaskets
    8. Cylinder Head Gaskets
    9. Engine Main Seals
    10. Engine Gaskets
    11. Sea Pump Gaskets
  15. GAUGES / CONTROLS / LIGHTS
    1. Marine Gauges
      1. Mega/Race Series
        1. Mega/Race Series Speedometers & Tachometers
        2. 2 5/8" Electric
        3. 2 5/8" Mechanical
        4. 2" Electric
        5. 2" Mechanical
      2. Industrial Series
        1. 3 3/8" Industrial Series Speedometer & Tachometer
        2. 2" Industrial Electric Gauges
        3. 2" Industrial Mechanical Gauges
      3. Vantage View Series
        1. Tachometers & Speedometers
        2. Small Slave Gauges
        3. Large Slave Gauges
      4. Deutch Connectors / Tools
      5. Gauge Bezels Flat / Angled
      6. Specialty Gauges / TCM Blow Out Gauges
      7. Air / Fuel Mixture Gauges
    2. Livorsi LED Indicators
    3. Gauge Senders / Warning Systems
    4. Control / Indicator Cables
      1. Mercury Control Cables
      2. Cable Ends / Clamps
      3. Teleflex Control Cables
    5. Controls / Throttles / Shifters
      1. Standard Handle Controls
      2. Billet Bent Handle Controls
      3. Side Mount Controls
      4. Control Accessories
    6. Trim Controls
      1. Stainless Cable Grips
      2. Clamshells
      3. Cable Ends
    7. Marine Navigation Lights
      1. LED Lights
      2. Navigation Lights
  16. HARDWARE
    1. Billet Aluminum Spacers / Stringer Washers
      1. Billet Aluminum Washers
      2. Billet Aluminum Spacers
    2. SS Hardware / Fasteners
      1. 1/4"
        1. Bolts
          1. Socket Head / Allen Head
          2. Hex Head
        2. Washers
        3. Nuts
      2. 5/16"
        1. Bolts
          1. Socket Head / Allen Head
          2. Hex Head
        2. Washers
        3. Nuts
      3. 3/8"
        1. Bolts
          1. Socket Head / Allen Head
          2. Hex Head
        2. Washers
        3. Nuts
      4. 7/16"
        1. Bolts
          1. Socket Head / Allen Head
          2. Hex Head
        2. Washers
        3. Nuts
      5. 1/2"
        1. Washers
        2. Nuts
    3. Grade 8 Hardware / Fasteners
    4. Specialty Hardware / Fasteners
  17. IGNITION SYSTEMS
    1. Ignition Components
      1. MSD Marine Distributors
      2. Ignition Coils
      3. MSD 6M2L Ignition Box
      4. Spark Plug Wires
      5. MSD Parts / Harnesses
      6. Distributor Caps / Rotors
    2. Spark Plugs
    3. Ignition Switches / Accessories
  18. LUBRICANTS / ADHESIVES / CLEANERS
    1. Oil / Lubricants
      1. Gear Lubricants
      2. Mercury Lubricants
      3. Amsoil Motor Oil
      4. Mobil 1 Motor Oil
    2. Spray Paint
      1. Mercury Paint
    3. Adhesives
    4. Sealants
    5. LocTite
    6. Cleaning / Polishing
      1. Boat Bling Sauces
      2. Polish - Wax - Detail Products
      3. Slimy Grimy Cleaning Products
      4. Bio-Kleen Products
  19. OUTBOARD PARTS
    1. Outboard Maintenance Kits
    2. Outboard Filters
    3. Outboard Zinc Anodes
    4. Outboard Belts
  20. PLUMBING / RIGGING
    1. AN Hose Ends / Adapters
      1. Chrome Brass Adapters / Fittings
        1. Chrome Brass Hose Ends
        2. Chrome Brass NPT Adapters
          1. Chrome Brass NPT Adapters Straight
        3. Chrome Brass NPT / Pushlock Adapters
        4. Chrome Brass NPT / Barb Adapters
          1. Chrome Brass NPT / Barb Adapters Straight
          2. Chrome Brass NPT / Barb Adapters 90 Degree
      2. Aluminum Adapters / Fittings
        1. Aluminum AN Fittings
          1. Aluminum Push Lock Hose Ends
            1. Aluminum Push Lock Hose Ends Straight
            2. Aluminum Push Lock Hose Ends 30 Degree
            3. Aluminum Push Lock Hose Ends 45 Degree
            4. Aluminum Push Lock Hose Ends 60 Degree
            5. Aluminum Push Lock Hose Ends 90 Degree
            6. Aluminum Push Lock Hose Ends 120 Degree
            7. Aluminum Push Lock Hose Ends 150 Degree
            8. Aluminum Push Lock Hose Ends 180 Degree
        2. Aluminum NPT / AN Adapters
          1. Aluminum NPT / AN Adapters Straight
          2. Aluminum NPT / AN Adapters 90 Degree
        3. Aluminum AN Reducers
          1. Male / Male AN Reducer
        4. Aluminum AN Unions / Couplers
          1. Male / Male AN Unions
            1. Male / Male AN Unions Straight
        5. Aluminum AN Caps / Plugs
          1. Aluminum AN Plugs
          2. Aluminum AN Caps
      3. Stainless Steel Hose Ends & Adapters
        1. STRAIGHT PUSH LOCK HOSE END
        2. 45° PUSH LOCK HOSE END
        3. 90° PUSH LOCK HOSE END
        4. STRAIGHT ADAPTORS
        5. 45° ADAPTORS
        6. 90° ADAPTORS
      4. Plumbing Tools
      5. SS Adapters / Fittings
    2. SS Water Pick Ups
      1. SS Transom Mount Water Pick Ups
      2. SS Cav-Plate / Bottom Mount Water Pick Ups
      3. SS Curved Water Pick Ups
      4. SS Adjustable Water Pick Ups
        1. SS Adjustable Water Pickups
        2. Extreme Duty 150 MPH+ SS Adjustable Pick Ups
        3. Custom Order Adjustable Pick Ups
    3. SS Water Crossovers
    4. Sea Strainers, Parts & Accessories
      1. Sea Strainers
      2. Parts & Accessories
    5. SS Water Dumps / Bulkheads
      1. Single Dump
      2. Dual Dump
      3. Single Dump Flush Mount
      4. Dual Dump Flush Mount "Wide Body
      5. Dual Dump Flush Mount "Narrow Bo
      6. Triple Dump Flush Mount
      7. SS Bulkhead Fittings
    6. SS Hose Tees
    7. Hose Clamps
      1. SS Adel Clamps
      2. Oetiker Clamps
      3. Oetiker Clamp Tool
      4. Steel Adel Clamps
      5. SS Hose Clamps
    8. Hoses
      1. Goodridge Stainless Steel Braided Hose
      2. Shield Marine Wet Exhaust / Water Hose
      3. Aeroquip Cloth Braided Hose
      4. Trident Marine Fuel Hose
      5. MerCruiser Hoses
    9. Exhaust Plumbing
    10. Thermostat Housings
      1. SS Thermostat Housings
      2. Thermostat and Gaskets
    11. Engine Plumbing Kits
    12. Engine Flushing / Ball Valves
      1. Ball Valves Polished SS
      2. Engine Flush
    13. Pressure Relief & Check Valves
  21. PROPELLERS / HUBS / ACCESSORIES
    1. Propellers
      1. Mercury Bravo 1
      2. Mercury Racing Bravo 1 FS
      3. Mercury Racing Bravo 1 Lab Finish
      4. Mercury Racing MAX-5
      5. Mercury Racing Maximus Lab Finish
      6. Mercury Mirage Plus
      7. Mercury Revolution 4
      8. Mercury High Five
      9. Mercury Racing CNC Pro Finish Cleavers
      10. Hydromotive Propellers
        1. Intimidator Quad IV
      11. MACH Propellers
        1. PSDM PATRIOT
        2. SDM STERNDRIVER
        3. STM TWISTER
      12. Bravo II & III
    2. Hub Kits / Installation
    3. Prop Wrenches / Mounts / Covers
    4. Propeller / Stern Drive Locks
  22. SAFETY
    1. LIFELINE JACKETS
  23. STEERING
    1. External Hydraulic Assist Kits
    2. Hydraulic Steering Hose Kits
    3. Helm Control Pumps
    4. Tie Bars / Steering Caps
    5. Steering Wheels
    6. Full Hydraulic Helm Kits
    7. Pumps / Tanks / Brackets
    8. Filters
    9. Hydraulic Steering Parts / Fittings / Accessories
  24. STERN DRIVES / TRANSOMS
    1. Stern Drives / Upgrades
      1. Complete Stern Drives / Uppers / Lowers
        1. Teague Custom Marine Platinum Drives
        2. IMCO Drives
          1. IMCO SCX Drives
          2. IMCO SCX4 Drives
      2. Drive Components
    2. Transom Assembly / Gimbal
      1. Transom Assemblies
      2. Gimbal Helmets / Rings / Service Parts
    3. Flush Kits
    4. Drive Spacers
    5. Extension Boxes
    6. Trim Pumps / Reservoirs / Tanks
    7. Nose Cones
    8. Bravo Drive Showers
    9. Propeller Aerator Kits
    10. Mercruiser Accessories
  25. SUPERCHARGERS / INTERCOOLERS
    1. Marine Superchargers
      1. Whipple Superchargers
        1. Whipple 8.3L / W510AX Supercharger "tuner Kits"
        2. Whipple 525 EFI Supercharger Kit
        3. Whipple 454 Supercharger Kit
        4. Whipple 502 Supercharger Kit
        5. Whipple 3.3L / W200AX Superchargers "Tuner Kits"
        6. Whipple 4.0L / W245AX Supercharger "Tuner Kits"
        7. Whipple 4.5L / W275AX Supercharger "Tuner Kit"
        8. Whipple 500 EFI Supercharger Kit
        9. Whipple 496 Supercharger Kit
        10. Whipple Accessories / Parts
      2. Roots Style Blowers
        1. 6-71 Blower Kits
        2. 8-71 Blower Kits
        3. 10-71 Blower Kits
        4. 14-71 Blower Kits
        5. 250 Blower Kits
      3. Blower Hardware
    2. Intercoolers
      1. Whipple Marine Intercoolers
        1. Whipple Cupronickel Billet Intercoolers
        2. SS Intercooler Inlet / Outlet Fittings
      2. Superchillers
      3. Intercooler Parts / Accessories
        1. Intercooler Belts
        2. Hi-Flow Billet End
        3. Intercooler Cores
        4. Intercooler Gaskets
        5. Intercooler Hardware
        6. Pressure Relief Valves / PRV
    3. Blower Drive Belts
      1. Serpentine Blower Belts
      2. 8mm Blower Belts
    4. Supercharger Pulleys
      1. 8mm Gilmer Pulleys
      2. 16 Rib B&M Style Pulleys
    5. Throttle Linkage Kits
    6. Mercury Racing ECU Upgrades
  26. TOOLS
  27. TRANSMISSION / ACCESSORIES
    1. Bellhousings / Coolers / Accessories
    2. Hydraulic Transmissions
  28. TRIM TABS
    1. Livorsi Trim Tabs
    2. Trim Tab Inside Hoses
    3. Mercury K-Plane Trim Tabs
  29. V-DRIVE
    1. Prop Puller
    2. Stuffing Boxs
    3. Gaskets and Seals
  30. WATER PUMPS / OIL COOLERS
    1. Water Pumps / Parts
      1. Sea Pump Rebuild Kits
      2. Back Plates / Brackets / Pulleys
      3. Sea Water Pumps
    2. Oil Coolers / Parts
      1. Oil Coolers
      2. SS Oil Cooler Brackets
      3. Oil Cooler Gaskets
  31. NEW / USED SPECIALS
    1. Mercruiser/Mercury Used Parts
    2. Sea Strainers
    3. Engines & Parts
    4. Fuel Injection Kits
    5. Propellers
    6. Fuel System Parts / Accessories
    7. Transoms / Trim and Parts
    8. MSD Ignitions Systems
    9. Intercoolers
    10. Gauges / Controls (Specials)
  32. HOT ITEMS
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