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.Dana BB Chevy 454 & 502 Performance  Exhaust!
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Flow Torque Exhaust Manifolds (pair)  
Dana Marine Flow Torque exhaust systems are
the highest quality performance exhaust on the
market. From our custom exterior design to the
inside runner length and diameter, no other
exhaust systems compare. We offer a wide
variety of riser styles to fit any application. Our
internal Vortex merge collector takes marine
exhaust to another level. Modeled after
automotive racing exhaust, our systems use
exhaust scavenging technology for optimum
performance. At Dana Marine, we deliver quality
and performance.
Risers sold separately.
List Price: $1200.00  
O2 Sensor Spacer Plate Set  EX-0022
These billet aluminum spacer blocks are
designed to fit in between the riser and manifolds.
They accept a standard O2 sensor. Includes (2)
spacers, mounting studs, and gaskets.  
List Price: $225.00  
Stainless Vortex IV Risers (pair)  ex-0400
VORTEX IV polished stainless steel risers with
merge collectors have a 3" Vortex I.D. This pipe is
designed for engines that make 410 HP to 500
HP. Our risers are designed to scavenge exhaust
and utilize all engine power.  
List Price: $1,125.00  
Stainless Risers - 4" Tube (pair)  EX-600
Polished stainless steel tube style risers for Flow
Torque exhaust systems. All stainless steel
construction with no internal Vortex cone
assembly. A high flow 3.5" inside diameter at a
lower cost. Accepts 4" exhaust hose.  
List Price: $890.00  
Stainless Vortex III Risers (pair)  ex-0300
VORTEX III polished stainless steel risers with
merge collectors have a 2.750" Vortex I.D. This
pipe is designed for engines that make 310 HP to
400 HP. Our risers are designed to scavenge
exhaust and utilize all engine power.  
List Price: $1,125.00  
Aluminum Risers Long (pair)  Ex-005
Long polished cast aluminum risers are
perfect for universal jet boat and I/O
installations. High flow ability with a lower
cost. Camshaft limitations do apply to prevent
water reversion.  
List Price: $495.00  
EX-0004  
Aluminum Risers Short - Silent Choice Systems
(pair)  
Short polished cast aluminum risers for silent
choice applications. Camshaft limitations do
apply to prevent reversion problems.  
List Price: $495.00  
Stainless Vortex V Risers (pair)  EX-0500
Vortex V polished stainless steel risers with
merge collectors have a 3.5" I.D. This pipe is
designed for engines that make 510 HP to 1200
HP. Our risers are designed to scavenge exhaust
and utilize all engine power.  
List Price: $1,125.00  
Dana marine performance
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Shift Bracket for Flow Torque Risers  EX0018
Shift bracket to adapt a Mercruiser shift
assembly to DMP Flow Torque exhaust. Use this
bracket to retain the stock location of your
Mercruiser shift assembly.  
List Price: $25.21  
Oil Filter Adapter Bracket  EX-0019
Oil filter bracket to retain the stock Mercruiser
oil filter head in the stock location when
installing Dana Marine exhaust.  
List Price: $38.00  
Q). What is reversion?
A). Reversion is the pulling back of
water from the riser where water enters
the exhaust. The water is pulled back
into the exhaust part of the head and
into the cylinders of the motor.
Reversion occurs with the exhaust
systems that utilize short stock type
risers when a cam change has been
made in the motor and duration of the
cam exceeds 230 degrees. Stock
motors do not have a problem with
reversion. To eliminate reversion long
stainless steel risers are utilized for
systems with altered cams. These are
jacketed and inject water into the
exhaust at a point much farther from
the motor thus eliminating reversion.
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$1040.00
$1040.00
$860.00
$1350.00
$25.00
$38.00
Updated 1/22/08
$225.00
These polished stainless steel risers are
designed for lowered exhaust locations
such as under a swim platform.
Vortex V risers feature a 3.5" Vortex I.D.
This pipe is designed for engines that make
510 HP to 1000 HP. Sold in pairs