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  1. #1
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    300x Exhaust Mod

    Let's get ready to "RUMBLE"..........

    Always did exhaust mods on my previous motors because I do like the sound of a big motor with a Tuner in it and now since I've got one of the big boy's I thought I'd do an exhaust mod project to the stock mid on my 300x. It's a perfect choice because of it's massive size and flat back not to mention it's cast very stout. I wanted to have it look like it came that way from Merc. Word of caution to anyone wanting to do this, there is an area at the bottom in the mid the you don't want to cut through because it's a cast reenforcement. So here's my version of an offshore 300x mid.............What cha think ?????????

    BEFORE:


    AFTER:

    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

  2. #2
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    Treasure Island Fl
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    Looks cool... Bet that sucker sounds awesome.....,
    Cawley

  3. #3
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    Quote Originally Posted by native2 View Post
    Looks cool... Bet that sucker sounds awesome.....,
    Hope to fire it up Saturday and maybe get a sound clip.........
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

  4. #4
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    Very interesting, looks great

  5. #5
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    Gary

    That's gonna turn a lot of heads at the dock when you fire it up! Gotta love the sound of a 3.0 with a tuner
    85 Checkmate Starflite
    MAD/Wolf 225 EFI


  6. #6
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    Quote Originally Posted by opsdave View Post
    Gary

    That's gonna turn a lot of heads at the dock when you fire it up! Gotta love the sound of a 3.0 with a tuner
    Gonna fire it up tomorrow Dave. I did notice last time I had it fired (before the exh. mod) that the exhaust is allot deeper in sound than the 250 EFI w/a Tuner was. I think it's because of the larger ID volume of the 300x mid since the compression was about the same on the 250 w/the 300 heads. The inside of the 300x mid is a Grand Canyon in comparison to the std. EFI mid's.
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

  7. #7
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    Gary

    I know it's been a while, but how do you think the sound of the MAD/Wolf compared to the X?
    85 Checkmate Starflite
    MAD/Wolf 225 EFI


  8. #8
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    that thing has got to be loud, lol!!!!!!!!!!! sweeeeeeeeet!!!! should sound good gary, i didn't have the heart to cut mine. i would've run the boat first, the offshore mid w/ just trimming out the bottom is fairly loud(my captn steve's boat has the bass mid that we modded and its nowhere near as loud as mine) i'd be curious to see how loud your boat is!! can you see the tuner thru the hole? i remember that the mid has some internal dividers and didn't remember if the back was open to the exhaust
    action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. 21 skater/3 litre wolf efi 113 mph the engine build http://www.screamandfly.com/showthre...-3-litre-build

  9. #9
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    Charlie, I can't get enough of the sound. No water cop issues here with the sound either, besides it would only be heard when trimmed up and or at W.O.T. while on plane.

    When looking through the exhaust window the Tuner is right there in plane view. Like I said, I'll see if I can get a sound clip Saturday. The video portion of the clip will not be much to see as the motor is set to break-in mode...(heavy oiling in progress).....can you say Holy Smokes...........LOL.
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

  10. #10
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    gary, that looks really cool and bet it sounds bad azzz.

    96' STV Euro

    Smarta$$ of the
    Sunshine Syndicate,

    How to upload pics (click here)


    Quote Originally Posted by jphii View Post
    Well then, give her a $50 bottle of booze and don't let her know about the hookers, or what you spend on them
    Quote Originally Posted by 1BadAction View Post
    oh no. i just realized I am the voice of reason on a thread. i am so done, RIP 1Bad.

  11. #11
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    Thanks, I have great hopes that it'll blow my mind...............check back next week for a sound clip.
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

  12. #12
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    I like it! Was it hard to do?
    Dave
    **********************

  13. #13
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    Do u think you will get any performance benefit by cutting the relief hole over a stock mid with the tuner?

  14. #14
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    Quote Originally Posted by dogeatdog View Post
    I like it! Was it hard to do?
    The most difficult part was to locate where the bottom cast stiffener rib was located. You "DON'T" want to cut into that as it provides case strength across the bottom horizontally. Other than that, I did it in a couple of hours having all the tools needed at my disposal.

    Here's the tool and material list:
    Roll of blue painters tape (for drawing the lay out on)
    Roll of duct tape (for the jig saw to ride on)
    6" flexable scale (line lay out)
    Sharpie (marking lines)
    Flat washer that 1/2" OD (marking corner radius x 4)
    Center Punch (locate centers of the 4 radius)
    1/8" drill bit and a 1/2" drill bit (pilot hole and finish hole)
    Jig Saw w/a new fine tooth blade (cut from hole edge to hole edge)
    Half round file (general shaping)
    Air Die Grinder w/some 120 grit sand rolls (finish edge & radius work)
    And lot's of patience in shaping straight and smooth to look like it was cast that way as OEM...........
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

  15. #15
    Join Date
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    Quote Originally Posted by Hoovershark View Post
    Do u think you will get any performance benefit by cutting the relief hole over a stock mid with the tuner?
    Performance gains..............LOL, absolutely NONE.......But damm it's gonna sound bad a$$...........
    https://youtu.be/IGkyssK27rU

    **Bullet Proof Foot Control
    **Smooth and fastest throttle response
    **2 LB's Lighter that any cast Hot Foot types
    **All "BILLET" construction, compare, you'll see this is the "BEST IN CLASS FOOT CONTROL"......contact me.


    Gary
    Life Time Member Of The
    Haul'n Ass, Burn'n Gas &
    Honorary Blown Motor Club


    Growing old is inevitable, growing up is optional.......

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