Like Tree0Likes

Exhaust Gains

Old 03-02-2009, 10:38 AM
Join Date: Sep 2008
Location: Newark, DE
My Boats: 2002 38'Ocean Express Catamaran
Posts: 967

I had an older 26 stinger with 350/375hp. I added the stainless marine exhaust, took the bottom paint off. I gained 6mph. On a GPS.

Not sure what got me the 6mph but I think a combo of both. I heard taking the bottom paint off adds 2-3 mph.. I think the exhaust definately lightened the load. ( From Merc cast to Stainless marine alluminum) I truly think I gained a few MPH with the exhaust too..
mmareno is offline  
Reply With Quote
Old 03-02-2009, 02:00 PM
Anarchy Powerboats's Avatar
Join Date: Jun 2004
Location: Phoenix, Havasu, Newport
My Boats:
Posts: 3,060

Originally Posted by GO4BROKE View Post
Most of the gains from switching 496 exhaust to aftermarket is from the removal of the "turbulators" that reduce the outlet about an inch. Supposed to be worth 10-12hp just for removing them. Do a search in the tech forum, there are a couple threads there. Doesn't cost anything to try.
True, but you also need to add a lil disclaimer here about the increased dangers that come along with their removal.
Anarchy Powerboats is offline  
Reply With Quote
Old 03-02-2009, 02:34 PM
noyzee's Avatar
Join Date: Jul 2008
Posts: 1,544

sounds like a prop for this season and the rest will be the bling. i already wax the hull but it seems my boat runs the same no matter what. ive put it in the water, fresh waxed hull, clean as can be and smooth. 1/4 tank of fuel, nothing on the boat just driver and some basic stuff, cool air and perfect water. the boat runs 60mph on gps.

i have then taken it out, heat of the summer 3/4 gas, 2 people, a cooler with beer and 2 weeks of salt water growth on the bottom and the boat goes 59-60 on gps.

i then had 7 people, 90 beers, 3 coolers, food coming out my ears, cloths, an inflatable boat in the v-birth fully loaded, full fuel dirty bottom etc etc etc and the boat still did 58 every time and 59 running with the wind on the way home with a little less fuel and a tad cooler air. its strange, but the boat runs the same pretty much all the time. lol seems fully loaded i can trim it up more tho befor the prop starts to spin so maybe that is the key, getting the boat up more with a little more prop.
i'll find out, im going to be calling todd this week to place my order.
noyzee is offline  
Reply With Quote
Old 03-05-2009, 11:14 AM
Join Date: Oct 2002
Location: Menasha,WI
My Boats: 04 Whaler 04 Fountain 38 Lightning
Posts: 269

A new E-Top for the 496/GM Big Block
Released at the recent LA and Miami shows, replaces the stock height riser exhaust and fits to original tail system or silent choice Y pipe diverter. CMI system at competitive to cast aluminum pricing. Fits 34.5 centers.Exhaust Gains-new496.jpg
jrz is offline  
Reply With Quote

Related Topics
Thread Starter
Last Post
Magic Medicine
07-17-2007 07:14 AM
General Q & A
09-25-2006 07:33 PM
General Boating Discussion
01-03-2006 10:24 AM
General Q & A
07-07-2003 04:05 PM
General Q & A
05-20-2003 06:43 PM

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

All times are GMT -5. The time now is 08:27 AM.

Copyright 2011 OffShoreOnly. All rights reserved.