IMCO Marine Exhaust
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 |
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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.
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| IMCO Marine Exhaust Powerflow Small Block GM "A" Kit |
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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.
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| IMCO Marine Exhaust Powerflow S-Pipe System |
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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.
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| IMCO Marine Exhaust Silent Choice System |
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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
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| IMCO Marine Exhaust Powerflow Plus System |
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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
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| IMCO Marine Exhaust Thumper Power GM V-6 System |
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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.
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| IMCO Marine Exhaust Thumper Power GM Small Block System |
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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.
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| IMCO Marine Exhaust Thumper Power GM Big Block System |
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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.
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| IMCO Marine Exhaust Riser Gaskets |
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These are all the popular IMCO riser gaskets. Don't be caught without spares. This is a common wear item. | ||||||||||
| IMCO Marine Exhaust Powerflow Accessories |
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Here are just a popular bracket
accessory for the Thumper Exhaust Systems that are available separately.
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