I replaced the muffler on my 1990 SI Hatch (stock motor) with a brand new OEM stock dual tip SI muffler. It fits well, but it is snug and almost touches the bumper. I noticed that there is a lot of vibration while at idle and my muffler seems to be rattling, like it is hitting he underside of the car. Also, the OEM SI tips that I put on rattle too. I made sure everything was bolted down and that nothing was loose. I was looking this up online and some sites say that it could be that my engine mounts need to be replaced and they are causing the excessive vibration. I don't think the mounts were ever changed, so it could make sense. Just want to get other opinions before I purchase the mounts and change them out. Also, anyone have any good recommendations for replacement OEM mounts, besides stock? I was researching and Beck and Arnley seem to have good ratings and are not terribly expensive.

 

You can ziptie the rubber exhaust hangers to stiffen it up and adjust the vibration frequency.
http://www.jukeforums.com/forum/atta...s-img_2274.jpg

Also fill in the old mounts, or new ones even to stiffen them like this. https://honda-tech.com/honda-crx-ef-...cheap-1124506/

 

you can bend the exhaust hanger to lower the muffler away from the body. It's likely rubbin g