Go Back  Offshoreonly.com > Technical > Restorations & Upgrades
Twin 496 exhaust upgrade cost >

Twin 496 exhaust upgrade cost

Like Tree1Likes
  • 1 Post By paul buckner

Twin 496 exhaust upgrade cost

Reply

Old 12-18-2018, 07:03 PM
  #1
Registered
Thread Starter
 
Join Date: Dec 2018
Posts: 1
Default Twin 496 exhaust upgrade cost

Hello fellas, i'm a soon to be owner of a fountain 35 executioner w twin 496s (all stock). I was thinking about some upgrades i might be interested in over the winter and of course a nice aftermarket exhaust is the 1st thing on my mind. Million $ question: why is a set of headers for a boat like this atleast 3k per motor, but +- $500 for the same motor (bbc) in a jet boat? The only visual difference i could tell is what looks like a water inlet for cooling on the offshore boats, and of course different bends for routing; whereas jet boat applications are ran dry.. any thoughts or input is appreciated.
OffshoreDre is offline  
Reply With Quote
Old 12-18-2018, 07:12 PM
  #2
Registered
 
Join Date: Sep 2014
Location: Portland, OR
My Boat: 1995 Fountain 32 Fever, WaveRunner 760 GP
Posts: 571
Default

Welcome! Many threads on here about 496 exhaust and the consensus (I have read) is that you will gain little to nothing over the factory pieces...
Diamond Dave is offline  
Reply With Quote
Old 12-18-2018, 09:33 PM
  #3
Registered
 
Join Date: Oct 2012
My Boat: 280 Velocity
Posts: 1,134
Default

Save your money
underpsi68 is offline  
Reply With Quote
Old 12-19-2018, 07:17 AM
  #4
Registered
 
Join Date: Apr 2013
Location: Lagrange ky
My Boat: 88 pachanga 22
Posts: 286
Default

paint and or polish the ones you have. the manifolds look good when painted and the risers polish up pretty good. they flow pretty good.
beaver 3 is offline  
Reply With Quote
Old 12-19-2018, 11:21 AM
  #5
Registered
 
Join Date: Nov 2009
Posts: 673
Default

Originally Posted by OffshoreDre View Post
Hello fellas, i'm a soon to be owner of a fountain 35 executioner w twin 496s (all stock). I was thinking about some upgrades i might be interested in over the winter and of course a nice aftermarket exhaust is the 1st thing on my mind. Million $ question: why is a set of headers for a boat like this atleast 3k per motor, but +- $500 for the same motor (bbc) in a jet boat? The only visual difference i could tell is what looks like a water inlet for cooling on the offshore boats, and of course different bends for routing; whereas jet boat applications are ran dry.. any thoughts or input is appreciated.
Headers for inboard Motors are water jacketed very labour intensive to make that's why they cost so much .
jet boat headers are usually single skin just like a car header .
payuppsucker likes this.
paul buckner is offline  
Reply With Quote
Old 12-19-2018, 12:06 PM
  #6
Registered
 
Join Date: Jan 2006
Location: Peoria, IL
My Boat: Center council
Posts: 2,315
Default

You also need a cam with higher overlap to realize the full advantage of long tube headers.
hogie roll is offline  
Reply With Quote
Old 12-19-2018, 06:20 PM
  #7
Gold Member
Gold Member
 
Join Date: Jul 2008
Location: Delray Beach, FL
My Boat: Baja 342 Raylar HO 600's
Posts: 2,995
Default

The only two choices are Dana or CMI.

Either one will only net you about 1 MPH. The stock manifolds aren't that bad, your sound might change a tad but not much.
Keith Atlanta is online now  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


OSO Sponsor
OSO Advertiser
OSO Advertiser
OSO Advertiser