So I got my Motoria on this past Wednesday and I'm very happy with it!! RSide headers really produce a really deep growl. The first day when I was driving it I noticed there was a lot of droning around 3,000 RPMs, and everything starts to vibrate. I first thought it was my wing that was vibrating, but now I realized that it's the muffler rattling.. sounds almost like metal on metal contact.

It only rattles at certain RPMs and/or when I put it into Park. It's only sometimes though, not all the time. Does this have something to do with the hangers? I'm really happy with the exhaust, the sound is throatey and deep-- all my friends say it has a distinct sound as well, so I hope the rattling is a minor fix. Even if the sound doesn't go away, I can deal.

 

Sounds very similar to my post don't it?

Get under the car and push around the muffler to see if comes into contact with anything, and look to see if the piping is close to the metal anywhere under there too. Where it goes over the axle and where it passes by the gas tank are the problem areas, at least for my exhaust, where it gets a little close.

Yours doing it in P leads me to think its not the header though. Hopefully yours is a problem like that, and not header buzz like I'm experiencing. Yours seems to be on a lesser scale though, might be in the design of your headers compared to mine.

 

Crap, well I dropped my car at a friends house at the moment until I get back from vacation. I hope I didnt do any damage to the piping. sad.gif Hopefully I can bring it to my exhaust shop and they can modify it a little bit.

 

dont bring it anywhere. do a search on these forums for poly exhaust mounts. they are a lot stiffer than rubber and dont let it move enough to hit anything. plus...they're blue. fing02.gif

 

...Is the only place they're sold on Ebay?

 

Wouldn't poly make it worse? The point of the rubber is to flex and absorb the vibration... you replace the rubber mounts when they get stiff and old. If the mounts are stiffer, they'll transfer the vibrations from the exhaust into the chassis. You don't want the exhaust motionless, it should have a little play in it.

Same way polyurethane motor mounts cause a rougher idle inside the cabin.

 

That's what I thought but..

http://www.rdtiburon.com/index.php?showtop...+exhaust+mounts

 

Ultratibby's piping going over the axle was hitting... thats a problem, stiffening the mounts is a bandaid, not a solution. Adding another location right there with a rubber mount is fixing it. He says himself it eliminated one stock location... the intelligent thing to do would be to put a hangar on the piping, use a rubber mount, and fix the problem with as little noise transfer as possible. Poly has to transfer more noise than a rubber mount. Adding another stock location would be a better fix and be a hell of a lot more quiet.

 

you sure its not the silencer in the muffler? i have the motoria and it does that

 

if its the exhaust vibrating so much that it is contacting metal around it, then stiffening it up will not allow it vibrate so much as to touch the metal that is close to it.

its tons different with motor mounts. you could hold your exhaust from vibrating without any mounts. the engine is THE source of movement.

poly mounts are not a bandaid at all. the amount of noise and motion transfered through those mounts, even if it is poly, is near nothing. especially when compared to noise coming from elsewhere. any type of material that is anywhere close to the elasticity of poly will kill everything coming to it.

you're reaching at straws man. buy some and try it out yourself and you will be thoroughly pleased.