I have a quick question regarding exhaust rattles.

because of my stupidity , me and my friends decided to install an aftermarket exhaust on my car when it was 21 degrees outside.

Well everything went on pretty good. But heres my issue.

The exhaust does not rattle at start up.
Exhaust sounds perfectly Okay UNTIL it gets hot. (after driving it for awhile)
It does not usually rattle while moving, only rattles when I am sitting at a traffic light, and sometimes when I am around 2500rpm, something rattles right underneath the driver's seat.

The rattle at idle is pretty loud and I assume it might be hitting the heat shield but just wanna make sure that its not possibly gasket issues.

BTW, the exhaust is WMS, it's 3inch around resonator and all that, I wonder if clearance is an issue..

Share your knowledge please
Thanks in advance!

 

I have a rattle on my car too. I thought it was the exhaust but it is an engine mount thats gone on my car, so check for oil around the offside engine mount. (The mount on the left if you stand infront of your car.)

 

Things to check:
Resonator could be bad and rattling inside.
Pipe could be hitting on the front edge of battery shield.
Pipe could be hitting rear bumper plastic.
If not centered perfectly in the tunnel, the middle hanger could be hitting the shield.

 

Yes sir!
I will make sure to crawl under and check it on sundy.. thanks!

oh and I got my mount replaced like a week ago.. so it shouldnt be a problem

 

sprp85,
What did you find out?

 

Heyyy
It was upper midpipe heat shield..!! The first thing I looked at
Thank you again!

 

Glad it was an easy fix.

 

i have the same issue , when it gets hot, the rattle starts when sitting at a driving light..... my rattle comes from the mufflers stainless steel hangers that go through the rubbers . these rubbers work against vibration.... but in my case when the car gets really hot and is driven aggressively, the rattle becomes very hard because the stainless steel mount rubbs in just one of the rubbery mounting hangers, which causes the exhaust to rattle....
i do not now what to do against this... but hey i have got the same freeking problem here...

i think someone suggested to rub some fat or grease of some sorts on it ....do not know what kind of lubricants exist for situations like this...