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cpperformance

CP Performance Boaters Shopping and Product Info Guide
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Imco Marine Exhaust Manifolds, Risers and Systems

imco logo Powerflow manifolds are manufactured using the finest materials and most advanced techniques available. The high quality aluminum manifold castings feature water jackets that surround each exhaust passage, including the port, to eliminate the possibility of burn out.

 The outside manifold surfaces are then coated with the highest quality epoxy powder coating available, creating a part that not only is highly corrosion resistant, but good looking as well. Features an external fitting to accept stock MerCruiser thermostat plumbing.

Click on the part number to check pricing or place an order.

IMCO Marine Exhaust - Powerflow Big Block GM "A" Kit
imco powerflow manifold bbc

This "A" pipe is used with Bravo drives or King Cobra drives. It's short design allows for thru transom exhaust tip hook-up. This system has a 10% horsepower increase and 40-50 foot pounds of torque on stock engines. All Powerflow systems are available fully polished.

Part No. Description
421-PF-82AK Powerflow Big Block Kit with Stainless Riser

IMCO Marine Exhaust - Powerflow Small Block GM "A" Kit
imco powerflow manifold sbc

Powerflow now offers a small block system. This system is designed after the big block kit using the same riser system. This system will increase your torque and horsepower by 10%. This system is also available fully polished, too.

Part No. Description
421-PFS-82AK Powerflow Small Block Kit with Stainless Risers

IMCO Marine Exhaust - Powerflow S-Pipe System
imco powerflow s-pipe manifold system

This "S" pipe is unique in many ways. It has an infinite number of advantages. This pipe will size up to many pre-existing port locations. It's great for below platform applications with large camshafts or high performance motors. It allows the exhaust to mix with water down at the first connection.

Part No. Description
421-PF-84SK

Big Block System Chevy with Stainless Risers

421-PFS-84SK Small Block System Chevy with Stainless Risers

IMCO Marine Exhaust - Silent Choice System
imco powerflow silent choice system

This popular system allows the use of a switchable exhaust diverter. These risers are stainless steel and custom designed to ease installation. They use a standard 4" diverter connection.

Part No. Description
 421-PF-85SAK

Powerflow Big Block System with Stainless Silent Choice Risers

421-PFS-85SAK

Powerflow Small Block System with Stainless Silent Choice Risers


IMCO Marine Exhaust - Powerflow Plus System
imco powerflow plus manifold system

IMCO's totally new Powerflow Plus cast aluminum, fully water-jacketed exhaust manifolds are available in black or polished. Black manifolds and risers are hard-coat anodized inside and out to withstand the tough marine environment. The new Powerflow Plus features IMCO's innovative patented design with 33" internal runners and a new ultra hi-flow exhaust riser. Brackets are available for this system

Part No. Description
421-PF-82K-PLUS-B

Black manifolds and risers - 30 degree

421-PF-82K-PLUS-P Polished manifolds and risers - 30 degree
421-PF-84K-PLUS-B Black manifolds and risers - 85 degree
421-PF-84K-PLUS-P Polished manifolds and risers - 85 degree

IMCO Marine Exhaust - Thumper Power GM V-6 System
imoc v6 chevy thumper system

At last for those of you seeking more horsepower from your V-6 powered boat there's now an economical system designed for maximum reliability and efficiency on stock engines. CNC machined for precision and quad ring sealed riser assure a perfect seal. Not silent choice compatible.

Part No. Description

421-TPV82KBS

Black V-6 Exhaust System w/Shift Bracket
421-TPV82KPS Polished Exhaust System w/Shift Bracket
IMCO Marine Exhaust - Thumper Power GM Small Block System
imco thumper small block manifold system

Here's an easy lightweight replacement for that heavy cast iron stock system. This entry level performance system is designed for stock engine application seeking a slight performance increase as well as weight reduction. Not silent choice compatible.

Part No. Description

421-TPS82KBS

Black Small Block Exhaust System w/Shift Bracket
421-TPS82KPS Polished Small Block Exhaust System w/Shift Bracket

IMCO Marine Exhaust - Thumper Power GM Big Block System
imco thumper big block manifold system

Are your cast iron manifolds failing? This could be the answer. A cost effective lightweight entry level performance system. This system was designed for efficiency and reliability on stock originally equipped engines. Not silent choice compatible.

Part No. Description

421-TP82KB

Black Big Block Exhaust System w/Shift Bracket
421-TP82KP

Polished Big Block Exhaust System w/Shift Bracket

IMCO Marine Exhaust - Riser Gaskets
early imco powerflow gasketlate imco powerflow gasket
powerflow plus riser gasketthumper riser seal

These are all the popular IMCO riser gaskets. Don't be caught without spares. This is a common wear item.

Part No. Description

421-RGK

Replacement Powerflow Riser Gasket, Early Style Round Hole (each)
421-RGKP Replacement Powerflow Plus Riser Gasket (each)
421-RGKC Replacement Thumper Power Riser Seal (each)
421-RGKN Late Style Riser Gasket (each)
IMCO Marine Exhaust - Powerflow Accessories
thumper shift and electrical bracket

Here are just a popular bracket accessory for the Thumper Exhaust Systems that are available separately.

Part No. Description
421-CB-88TPL Thumper Shift or Electrical Bracket*
* Must order 1 of each bracket per engine.