Hardin Marine Exhaust - Tailpipes & Risers

Seaward Standard Risers - Sold As A Pair

525 Seaward Tall Risers - Polished

Below Platform Seaward Risers - Sold as a pair

Low Port Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD. These tailpipes feature a 4" O.D and a 3-1/2" I.D. for maximum exhaust flow.

Seaward Custom 8.2L Risers - Sold As A Pair, 11-3/8" tall

Limited stock available, custom height risers. If you are in the market for a Seaward 8.2L system talk to a salesman to see if these fit your application, as it may have considerable cost reductions over building new risers.

Cyclone 525 Standard Dimension Tailpipe - Polished

This tailpipe is used on Cyclone manifolds that are adapted to MerCruiser® 525 engines. It's unique design requires additional hatch clearance in some applications. Consult for information regarding correct fit.

Additional Information:

• Standard Alpha/Bravo Exhaust Hole Locations
• Custom Measurement Instructions

HP500 EFI Risers, CMI Flange Pair

Pair Of Cast Aluminum Hardin Marine / Gil Marine Aluminum Risers

These 4” fully water jacketed one piece cast aluminum risers are the perfect answer to providing cast header style performance while reducing weight over factory cast iron systems. Perfect for all stock replacement applications. Reduces water with exhaust at the exit of the pipe.

Replacement HP 500 CMI Tail Pipes Standard Bravo, Early Model

These are factory replacements HP 500 EFI Tail Pipe replacements for Mercury Flange Header Early Models that have a straight jump hose.

Mercury OEM Part Numbers: 848739A1, 848735A1

Replacement HP 500 EFI Mercury Late Model Tail Pipes with 180° Jump Hose

For Stock Bravo Hole Location

Mercury OEM Numbers: 8M0053624, 845236A1

Seaward 3" Taller Risers - Sold As A Pair

Seaward 6" Taller Risers - Polished - Sold In Pairs

Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD

These tailpipes feature a 4" O.D and a 3-1/2" I.D. for maximum exhaust flow.

Seaward 600/700 Risers - Polished

Seaward XL BBC Bravo Tailpipes - Sold As A Pair

Seaward HP500 Standard BBC - Polished - Sold as a pair

Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD

These tailpipes feature a 4" O.D and a 3-1/2" I.D. for maximum exhaust flow. These systems are perfect for engines rated up to 525HP.

Seaward Standard 4" Bravo Dry Tailpipes - Sold As A Pair

Dry tailpipes refers to tailpipes that are water jacketed all the way towards the end of the tailpipe. This eliminates water mixing with the exhaust stream and causing "reversion" scenarios. This solid tailpipe design runs all the way through the transom and terminates approximately 5" outside the boats transom. A water discharge bung is provided in the top of the tailpipe inside of the transom and requires a separate water dump line and exit fitting. ***The line, fitting, and discharge fittings are sold separate.

These style of tailpipes require transom sealing rings that are again sold separately. Here is an example of what is commonly used 620-906700.

Seaward Standard Risers - Sold As A Pair

Gil Replacement Dry Big Gun Tailpipe - 4-1/2" O.D x 4" I.D.

This pipe can be used as a replacement or as an upgrade to build the very most power with a dry exhaust system.  The popular Big Gun pipe has been a favorite of customers with large supercharged engines.

Gil Replacement Dry Offshore Tailpipe - 4" O.D x 3-1/2" I.D. (Sold As A Pair)

This pipe can be used as a replacement or as an upgrade to build the very most power with a dry exhaust system.