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.
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.
Part
No. |
Description |
421-PF-82AK |
Powerflow Big Block Kit with Stainless Riser |
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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.
Part
No. |
Description |
421-PFS-82AK |
Powerflow Small Block Kit with Stainless Risers |
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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.
Part
No. |
Description |
421-PF-84SK |
Big Block System Chevy with Stainless Risers |
421-PFS-84SK |
Small Block
System Chevy with Stainless Risers |
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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.
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 |
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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.
Part
No. |
Description |
421-TPV82KBS |
Black V-6 Exhaust System w/Shift Bracket |
421-TPV82KPS |
Polished Exhaust System w/Shift Bracket |
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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.
Part
No. |
Description |
421-TPS82KBS |
Black Small Block Exhaust System w/Shift Bracket |
421-TPS82KPS |
Polished Small Block Exhaust System w/Shift Bracket |
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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.
Part
No. |
Description |
421-TP82KB |
Black Big Block Exhaust System w/Shift Bracket |
421-TP82KP |
Polished Big Block Exhaust System w/Shift Bracket |
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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.
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) |
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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.
Part
No. |
Description |
421-CB-88TPL |
Thumper Shift or Electrical Bracket* |
* Must order 1 of each bracket per engine.
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