IMCO Marine Exhaust Systems - Tailpipes

Small Block std. Stainless steel "SA" riser pipes are designed for Mercruiser Silent Choice, Corsa Quick and Quiet (with modifications), and IMCO's Sound Advantage systems. They can also be used with our Aluminum "S" pipes part number 02-1225 for under swim step applications.

When using these risers it's best to order 2 each 02-2242 oval hoses for the wishbone connection. 3/4"npt fitting is used on front of pipe for thermostat housings that have (4) 1" hoses water to go to exhaust manifolds, if needed click on (ADD BUNG). Shift bracket, ECM, or EFI brackets available as bolt on or welded to the risers.To order see PowerFlow Accessories or Related Products. (Sold in pairs)

Small Block 3" Stainless steel "SA" riser pipes are designed to replace stock Mercruiser Bravo exhaust with 3" riser block between manifold & Riser. 3/4"npt fitting is used on front of pipe for thermostat housing that have (4) 1" hoses water to go to exhaust manifolds if needed click on (ADD BUNG). Shift bracket, ECM, or EFI brackets available as bolt on or welded to the risers.To order see PowerFlow accessories or Related Products. They can also be used with our Aluminum "S" pipes part number 02-1225 for under swim step applications.

Small Block 6" Stainless steel "SA" riser pipes are designed to replace stock Mercruiser Bravo exhaust with 6" riser block between manifold & Riser. 3/4"npt fitting is used on front of pipe for thermostat housing that have (4) 1" hoses water to go to exhaust manifolds if needed click on (ADD BUNG). Shift bracket, ECM, or EFI brackets available as bolt on or welded to the risers.To order see PowerFlow Accessories or Related Products. They can also be used with our Aluminum "S" pipes part number 02-1225 for under swim step applications.

Thumper Power Risers (Black)

IMCO's affordable alternative to stock cast iron Chevy risers. Our all cast aluminum risers will increase Horsepower, RPM, and Torque by 5 to 7% over stock cast iron manifolds and risers at a fraction of the cost. We have designed Thumper Power for everyone whether you're a high performance or family recreation boater. Kits are available for Chevy big block, small block, and V-6 motors. Available in black powder coated, optional hard anodized for corrosion (prior to powder coat), and polished. (SOLD IN PAIRS)

Shift, EFI, or ECM brackets sold separately.
When using these risers, it's best to order 2 each 02-2242 oval hoses for wishbone connections.

Thumper Power Risers (Polished) (Sold in pairs)

IMCO's affordable alternative to stock cast iron Chevy risers. Our all cast aluminum risers will increase Horsepower, RPM, and Torque by 5 to 7% over stock cast iron manifolds and risers at a fraction of the cost. We have designed Thumper Power for everyone whether you're a high performance or family recreation boater. Kits are available for Chevy big block, small block, and V-6 motors. Available in black powder coated, optional hard anodized for corrosion (prior to powder coat), and polished. (SOLD IN PAIRS)

Shift, EFI, or ECM brackets sold separately.
When using these risers, it's best to order 2 each 02-2242 oval hoses for wishbone connections.