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Silent Thunder box VS Mufflers VS open

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Old 05-10-2018, 10:11 AM
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Default Silent Thunder box VS Mufflers VS open

Hey,
I was just wondering about some exhaust options. I got my 96 303 with 502's with the Silent Thunder box removed. The previous owner gave me the box (which is in great shape), but I have been hesitant to put it on. I mostly like the sound of the straight exhaust, but here in Cape Coral, sometimes it fun just to canal cruise. But, it's a little obnoxious cruising the canals with a pair of straight piped 502's behind me. So, I was wondering about maybe some muffler options instead. Any suggestions?
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Old 05-11-2018, 01:24 AM
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Some switchable mufflers would probably be your best option. They take a lot of bark out of the exhaust.
Drew Marine Shotguns also work pretty well. They are automatic and open more as you increase rpms.
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Old 05-11-2018, 08:55 AM
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I have the silent thunder on my 242. I personally love it. I get the bark at start up and a slight rumble at idle. It sounds great and isn't obnoxious like my donzi. They each have three place but I like being able to pull in somewhere and not have to worry about upsetting anyone. I get the straight pipes like my donzi but anytime someone wants to talk from another boat I have to shut it off. If I were you I would try the silent thunder and see. You can always open up the bottom like some do to make it louder when running.
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Old 05-11-2018, 11:36 AM
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My 357 with 2 454-485 hp with silent thunder ran 93 decibel at idle 3 feet away from the back of the boat, if that may help... lake georges rule was 90 db max...
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Old 05-11-2018, 12:08 PM
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Originally Posted by jeff32
My 357 with 2 454-485 hp with silent thunder ran 93 decibel at idle 3 feet away from the back of the boat, if that may help... lake georges rule was 90 db max...
Is that 93 db with the water drains in or out?
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Old 05-11-2018, 05:20 PM
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In, if i recall right
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Old 05-11-2018, 06:35 PM
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My silent thunder is cut with 2 tips right above the drive. I love it. Just enough attitude at the dock, nice cruise that isnt loud at all.
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Old 05-12-2018, 12:47 PM
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I would NOT put the box back on. It adds unneeded weight right over the drives. Griff’s idea is great. I think you’ll get the best of both worlds.

Sell the box.
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Old 05-14-2018, 08:52 AM
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Originally Posted by jeff32
In, if i recall right
when mine are in it's pretty quite at idle
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Old 06-23-2018, 02:52 PM
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On my 353, the box had issues after a year or two so we installed silent choice along with muffler tips. Happy ever since (after I removed the rpm-based actuator module that flipped the silent choice on and off continuously at around 3000 rpm LOL).
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