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Silent Thunder removal on newer FasTechs

Old 11-19-2010, 02:15 PM
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we just removed ours...someone on here said it weighed 270 lbs...not even close...it was more like 50-75 lbs. not sure why that number was so inaccurate. anyways all we have left is to install some flappers and see how she sounds.
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Old 11-19-2010, 06:08 PM
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Originally Posted by moses0324 View Post
we just removed ours...someone on here said it weighed 270 lbs...not even close...it was more like 50-75 lbs. not sure why that number was so inaccurate. anyways all we have left is to install some flappers and see how she sounds.
It sounds a lot better. I removed mine and put some 8" slash cut pipes on the back. Looks good and sounds WAAAAY better!
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Old 11-21-2010, 09:27 AM
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Originally Posted by moses0324 View Post
we just removed ours...someone on here said it weighed 270 lbs...not even close...it was more like 50-75 lbs. not sure why that number was so inaccurate. anyways all we have left is to install some flappers and see how she sounds.
I can imagine the dry weight is something like 50-75 lbs. But when on the boat, they accumulate water and become much more heavy. I would imagine the numbers you've heard is not far from true.
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Old 11-22-2010, 07:51 AM
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i guess the wet weight makes sense...I would be hard pressed to think it would be 300 lbs though. mainly i am looking for better sound and better performance out of the hole...our 292 is really sluggish to get on plane.
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Old 11-29-2010, 04:18 PM
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Default exaust tips

So I take it the consensus is that the stock stainless weighted flappers wouldn't be sufficient in stopping water injestion? Even with the CC down tube just upstream of the flappers?
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Old 11-30-2010, 11:04 AM
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Originally Posted by supercat View Post
So I take it the consensus is that the stock stainless weighted flappers wouldn't be sufficient in stopping water injestion? Even with the CC down tube just upstream of the flappers?
For 9 bucks a piece I think it's worth putting external flappers on in addition to the internal weighted ones. That being said, I went boating for a few weekends with no external flappers. I was very careful, and it was on a calm lake. I now have the rubber ones installed as well.
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Old 11-30-2010, 11:27 AM
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X2 for $10 a piece...add the external flappers. Is $40 really worth risking rebuilding / replacing a motor.
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Old 04-14-2015, 09:15 PM
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Sorry for digging up an old thread but I have been thinking about removing the ST box as well. I see all the talk about the SS tips being there, that's awesome. My question is, the ST box has little black rubber tips that the water from the exhaust runs out ?? Im not familiar enough to know is terminating the water something else that has to be handled too ?? Or is it just running out if the SS tip all are talking about and then running out of the block rubber tips ?? This is a 1999 382 Fastech I'm asking about. Thanks guys for any help or pics you can share. SJ
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Old 04-14-2015, 09:21 PM
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Just ss tips That dump exhaust and water into St box
Rz to remove then put on the rubber flappers.
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Old 04-14-2015, 09:30 PM
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Great to hear. Hoping it's as simple as it sounds. Thanks.
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