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Thread: Tohatsu M40D Build 40 50

  1. #31
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    Jul 2019
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    Sharp motor! Did you change or mod the tuner?

  2. #32
    Team Member
    Join Date
    Feb 2015
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    I did change the tuner to the M50D tuner. This was originally a 2004 M40D2 motor. There are 3 tuners for this motor. M40D is the smallest, (M40D2 & M50D2 are the same), and M50D has the largest diameter pipe.

    I did not modify the tuner in any way. I started to dry stack it and take the water out of the exhaust pipe, but decided I didn't want to risk possible long-term dependability by doing that.

    Maybe someone who knows more about dry stacking can comment on this subject.

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