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Thread: Exhaust Gains

  1. #31
    My Boats:
    2002 38'Ocean Express Catamaran
    Join Date
    Sep 2008
    Newark, DE
    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..

  2. #32
    Registered Anarchy Powerboats's Avatar
    My Boats:
    Join Date
    Jun 2004
    Phoenix, Havasu, Newport
    Quote 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.

  3. #33
    Registered noyzee's Avatar
    Join Date
    Jul 2008
    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.

  4. #34
    jrz is offline
    My Boats:
    04 Whaler 04 Fountain 38 Lightning
    Join Date
    Oct 2002
    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.New496.jpg

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