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General Category >> Rubber Side Down! >> Trouble with Dyna Muffler
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Message started by ClayJo on 10/12/25 at 20:09:23

Title: Trouble with Dyna Muffler
Post by ClayJo on 10/12/25 at 20:09:23

Hey guys, I recently bought a 2018 S40 and have followed this thread to rebuild and rejet my carb, install a raptor petcock and raise my seat. So here I am at the last piece of the Trifecta, doing the Dyna slip on. I bought the 65747-94 model which requires the least amount of work. I followed Serowbot's guide to install using tin can gasket and T bolt clamp but I cannot get this thing to seat fully. It stops with about a quarter inch gap left. I've attached photos. Any help us greatly appreciated. This is my first post so I hope I am following the proper procedure. - Clay

Title: Re: Trouble with Dyna Muffler
Post by blod on 10/13/25 at 06:14:04

I used the exact same silencer on my Savage, I did not use a tin can gasket, it fitted perfectly without modification. I did not need to rejet the carb either :)

Tip ! get one of these for a factory looking finish.

https://www.ebay.ca/itm/174236617833?_skw=heat+shield+exhaust&epid=17040275016&itmmeta=01K7EWVRD780WYEXYMMGTKTM04&hash=item28914fcc69:g:rE0AAOSwjOJnP5Zt

Title: Re: Trouble with Dyna Muffler
Post by ClayJo on 10/13/25 at 07:07:41

Did yours sit flush with the end of the downpipe? Did you need to hammer it on? I tried the tin can gasket but am having a leak. I followed the guide and cut slits down the flange to help it on but it looks like it tapers inside and gets caught at the very end of the downpipe :'(

Title: Re: Trouble with Dyna Muffler
Post by blod on 10/13/25 at 08:16:58

I can't remember having to hammer it on, I think it was just a push fit. My silencer slits are not cut

Try shortening your down pipe ( a little bit at a time ) so that it fits properly, it's less likely to leak then.

Title: Re: Trouble with Dyna Muffler
Post by uranusklingon on 10/13/25 at 10:46:42

I started doing the tin can gasket, but didn't care for it. I ended up just using some exhaust sealant goop from a tube from auto zone. Then I put an exhaust clamp on it.

EVIL ENERGY 1.75" Heavy Duty U Bolt Exhaust Clamp, 1 3/4 Inch Stainless Steel U Muffler Clamps, Saddle Style, 2PCS