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Thread: AFTER MARKET EXHAUST or NOT?

  1. #1
    2prop
    Hey guy's i need some imput and thought's, my boat has twin 350 mags. with stock Merc. exhaust , will i see an increace in low end , and see an increase in top end ,with an after market exhaust system, and what do you suggest, any help will be greatfully apprecated.

  2. #2
    Senior Member
    Join Date
    Nov 2009
    Posts
    4,409
    no you will not dont waste your money.

  3. #3
    Tinkerboater
    It all depends if you want to do anything else to the motors. Do you have through transom exhaust? The motors will breath better and you will loose some transom weight. You will gain some speed but not worth the $ if your not planing to do anything else to the motors. Do the transom exhaust first.

  4. #4
    2prop
    thanks for your reply's , it has tru hull exhaust, sounds like i would be wasteing my money.

  5. #5
    Racing Ray
    .
    [This message has been edited by Racing Ray (edited March 12, 2002).]

  6. #6
    Racing Ray
    .
    [This message has been edited by Racing Ray (edited March 12, 2002).]

  7. #7
    kab
    Racing Ray- What engine package are you running? I have a 502 efi with whipple. Dustin recommends powerflows. I was planning on making the purchase but maybe not.

  8. #8
    Racing Ray
    .
    [This message has been edited by Racing Ray (edited March 12, 2002).]

  9. #9
    Tinkerboater
    It would increase your cruise speed only if it increased your torque (and) you installed a higher pitch prop ( cruise rpm before = x mph is same rpm-speed after headers)

  10. #10
    Senior Member
    Join Date
    Nov 2009
    Posts
    4,409
    i think on a hp 500 and above you would see good results.but the guy who bought my 21ft ultra 350 mag put on powerflows and seen no gain.

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