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Exhaust pressure fouling plugs

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By Guest
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Hello,
I hope someone here can help me. I have a 1999 Mercury 175 EFI on a Crestliner 21' Phantom. When idling in gear I have to trim the motor up to get the exhaust port out of the water, or else it will start building up pressure and foul the plugs. Not a big deal but I saw another boat with what looked like an exhaust snorkel on it. It attached to the motor and then angled up 4 or 5 inches so the exhaust could exit above the water level without trimming the motor. Anyone know what this accessory is called or where to get it? Any help would be appreciated.
Thanks,
David

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