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HELP- Swapping Flappers to SS Silent Tip Exhaust


Dacon62
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Have a Prostar and want to swap out the flappers to STE. Like the boat a bit quieter. Dealer says will take 6-8 hours ($129/hour shop rate) to do the job and he’s apprehensive to do it.

 

Complications are,

1) Hose clamp access. 2 of the 4 gears are on the side of the exhaust are not accessible because the fuel tank.

2) 3M 5200 adhesive is a bear. Could tear out some gel.

3) Hard to cut hose clamps off with a cutting wheel because cutting blind also danger of explosion as fuel tank is right there.

 

Anyone out there done this and could offer some advise. Thanks.

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Cut the adhesive with fishing line. Cut the clamps with a wire cutter. Use a heat gun to warm up the hoses before trying to pull them off.

 

Cool factor? You spend a lot of time looking at the back of your boat on the trailer?

 

In these days of no carpet, I highly doubt that the flange change is going to make much difference in the boat noise.

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Have heard of a 5200 solvent called Debond and piano wire but not fishing line.

The biggest challenge I think is getting the hose clamps off they are very tight and countersunk into the exhaust hose rubber, not to mention hard to access.

One guy on TT said he had loosened the clamps that attached the exhaust hose to the mufflers and after softening and prying the exhaust flange off he was able to pull the exhaust hose out through the through hull bored hole and get to the clamps that way.

Question is I don’t know if the bored hole is big enough on a Prostar to get the exhaust hose with the clamps on out the hole? He did not mention which boat model he had.

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I swapped out the plastic tail pipes to stainless tips on my Malibu, was not too bad a job. It has inline mufflers so getting those out created room to pull exhaust hose forward. I loosened the clamps on the tips first, spun the muffler to break the rubber hose free as it provided a surface to grab. hose clamps were not super friendly to pop off, IIRC used a stubby screwdriver for them. Heat, piano wire and solvent were used on the tips but they were not really that bad and since the tips were 4" the surface was not super important as the original tips were much smaller.
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When I changed the exhaust hose on my 205 I just took the rear floor off lay down on the floor, reached under the fuel tank and used a 5/16 socket on a 1/4 ratchet to get to the hose clamps. Once the hose was off I could have accessed the rear of the flappers if I'd wanted to replaced them (I didn't though as I like the sound and the backwash protection they provide!)
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I’m shocked that anyone would want to invest this much time effort and money into making it quieter. If it was too loud why would you buy the boat in the first place? Those MC’s sound great, and aren’t in any stretch loud...IMO.. You guys must be really anxious for the electric boats to arrive.
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@MDB1056 I have permitted course on public water that can be revoked by the lake association at any time. So I need to be respectful of everyone. This includes boat noise and even the language of myself and ski buddies. I installed a FAE a couple of years and it's been worth every penny I spent on it. Not one complaint about noise since it was installed and no I'm not intrested in an electric boat.
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