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Hardin Marine Cyclone Exhaust:

If you are one of thousands of performance boaters seeking the power and styling from stainless steel tubular headers then you're looking at the leader in exhaust technology. These "Cyclone" header systems share 100% 316L stainless steel construction. All appropriate flanges are laser cut and CNC machined for a perfect gasket seal. Each individual exhaust tube is bent to precise, exact tolerances every time. A computer designed fully welded water inlet manifold provides equal water distribution to each exhaust runner tube. While each set of headers goes through a 1900 degree annealing process that multiplies the durability factor of the header many times over while providing added protection against corrosion. But the heart of these systems lies in the ability to generate loads of additional power. By using CAD-5 Technology to develop a unique staggered tube runner length, these systems are capable of maximizing the broadest low end and midrange torque, all the while yielding incredible peak power gains. These systems are available in many configurations to fit every boaters needs. Rest assured when you lay down your hard earned money because the system comes complete with all necessary mounting bolts, gaskets, and shift and oil filter brackets making installation a snap.

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

Cyclone Water Jacketed Header System
 

This Cyclone wet exhaust series header works perfectly on both stock and modified performance applications. This header mixes engine cooling water with the exhaust near the end of the tailpipe. That allows you to use a 4" rubber hose connection to attach your transom mounted exhaust tips. This is the perfect replacement for your factory exhaust system. Oil filter, shift control, ECU brackets, gaskets, and bolts included.

496/8.1 liter must order installation kit.

Part No. Description

620-32005

 Big Block GM Bravo wet system Full Polish
620-32010 Big Block GM TRS wet system Full Polish
620-32015 Big Block Ford universal system Full Polish
620-32020 Big Block GM custom measurements Full Polish
Cyclone Sound-Select System
 

This is one of the easiest horsepower enhancing exhaust systems available today! For boats currently using a switch-able exhaust diverter system, this was designed to replace MerCruiser big block silent choice systems. This system will save up to 80 lbs. compared to cast iron ones. Oil filter, shift control, ECU brackets, gaskets, and bolts included.

496/8.1 liter must order installation kit

Part No. Description
620-32040 Big Block GM Sound Select Full Polished
620-286100 Small Block and Big Block Chevy Single Engine
Std Exit System
Cyclone H/P Air Sound-Select
 

At last, a true high performance header with an air activated diverter built-in. This gorgeous, one-piece-design tailpipe is the perfect choice for the power hungry boater who is seeking to reduce noise. This system is sold complete with all necessary hose fittings, pump, brackets, gaskets, and bolts.

496/8.1 liter must order installation kit

Part No. Description

620-32050

 Big Block GM H/P Air Sound Select Full Polished
Cyclone Low Exit System
 

This Hardin Marine Cyclone system is designed around an application where an incorporated swim platform creates the need to exit the exhaust in a lower than standard location. Through the use of a floating elbow positioning of the exit is somewhat maneuverable, these systems are perfect for limited access applications. Oil filter, shift control, ECU brackets, gaskets, and mounting hardware are included

Part No. Description
620-32060 Big Block Low Exit System, Full Polished
Cyclone Dry System
 

For those of you seeking the ultimate performance from your large cubic inch, aggressively cammed, naturally aspirated or supercharged engines. This double-walled tailpipe discharges all of its cooling water through a 3/4" NPT bung in the side of the tailpipe. It keeps the exhaust gas from coming in contact with any discharged water. These tailpipes extend through the transom and require the additional purchase of transom sealing rings.

Part No. Description
620-61020 GM Big Block Dry System Full Polished
620-906700 Transom Sealing Rings
Cyclone Big Gun
 

At last the Biggest and the Best System available for the ultimate in performance. These systems use an actual 4" internal pipe with a massive 4-1/2" outer shell. These systems produce almost non-existent restriction to exhaust flow through the double wall water jacketed transom tail section. These systems are referenced as dry tailpipe due to the fact exhaust flow never makes contact with the discharged water. Each of these systems are designed for large cubic inch high horsepower and supercharged applications. Additional transom sealing rings will need to be purchased separately. When only the best will do Cyclone delivers. Note: all Big Gun riser/tailpipes are custom built, a simple measurement guide is all that's needed to complete. Allow 7-14 working days to build.

Part No. Description
620-32080

Big Block GM Big Gun System - Polished Bottom with Polished Risers
Cyclone Big Gun Stealth
 
If you're one of the thousands of power boaters today with huge horsepower that's trying to tame the noise Hardin marine has the answer with the all new "Big Gun Stealth". This system incorporates the famous 4" internal Big Gun tailpipe with a fully water cooled integrated pneumatically air operated silencer system. When the silencer system is activated the exhaust flow is redirected through a delta style expansion chamber. This design has been tested to be one of the most advanced and least restrictive silencer systems anywhere. With the silencer disengaged you'll have uninterrupted full capacity exhaust flow all the while knowing that you now can have the best of both worlds from one superior header system. This system comes complete with mounting hardware, gaskets, and the pneumatic air operation control panel and lines.
Part No. Description
620-32090 Big Block GM "Big Gun Stealth" Polished Bottom / Polished Risers
Cyclone "Shorty Header" - Replacement Header For Gil Marine, Mercury Hi-Performance & Power Torque Manifolds
 
If you're one of the thousands of customers making the migration away from after-market exhaust manifolds, to the ultimate power producing tubular header systems, then Hardin Marine has developed the answer in their manifold replacement "Shorty Header". These units are designed to directly replace your cast aluminum manifolds. By retaining your existing stainless steel tail/riser pipe, you can remove your dated manifolds and simply slide the new "Shorty Header" into place and re-install your existing tailpipe. These units are currently available to replace Mercury Hi-Performance, Gil Marine, and Rex Marine Power Torque manifolds with more new models available soon. Each header shares 100% 316L stainless steel construction, laser machined flanges for a perfect gasket seal, exhaust tubes are B.T.B. bent to exact tolerances every time. Fully welded computer designed water inlet manifold assures equal water flow to each individual exhaust tube. These headers are completely annealed to maximize durability while preventing corrosion. CAD-5 technology develops a staggered length exhaust tube runner for broader low and mid range torque, while yielding incredible peak power. Every kit comes complete with all necessary attaching bolts and gaskets so you can rest assured that you're getting everything that you need.
Part No. Description
620-32001 "Gil" manifold replacement, Polished finish
620-50010 EGT bung installed (each)
620-50020 O2 sensor bung (each)
Computer Re-calibration
 
If you plan to install these headers on your electronic fuel injected engine, you will need us to re-configure your electronic control module.
Part No. Description
620-75302 Non-Supercharged Engines
620-75303 Supercharged Engines