Today I noticed a rattling noise under my car. It happens only at around 1000-1200 rpm's, but it's fairly loud and very annoying. I think it may be the cat, however I have had it on for a few weeks now with no problems. Anyone have any ideas? Thanks.

 

downpipe? exhaust?

 

i had this problem and it was the silencer in my exhaust.. it cam loose. you have one in?

 

I have a rattle also..Im going to try the Kartboy Exhaust Hangers. They are much stiffer and hold the exhaust in place alot better.

 

No I dont. My car is going into AMS on Wednesday, they're the ones who installed the exhaust (hell, it's their exhaust) so im hoping that they will be able to fix it. I love their customer service there, they will do just about anything for their customers.

 

yea I noticed a rattle today when I shut my door. I realized there is a lil metal flap that hangs down near the middle of the car. It flaps against my exhaust pipe. I guess it was conformed to fit to the factory exhaust pipe. Ahh well no big worry just annoying when I close and shut the door.

 

I'm having a similar issue. I recently installed a Helix hi flow cat(last night) and have noticed a horrific rattle under 1000 rpm when idling. I've had a catback and dp on there for over a year and had no rattling but, as soon as I bolted this piece it rattles so bad I thought the bolts fell out and my cat back was dragging the ground. Any ideas? I'm thinking it is a piece of heatshielding rubbing on something but, I'm not sure.

 

noises like that make me wanna

 

You might have checked already but is your lower arm bars rubbing against your dp?

 

I took my car to AMS because of it (i got their exhaust) and they said that something broke inside the cat, so they replaced it for me for free.

 

I think I've got it fixed. The flanges on the Helix Cat for whatever reason are close to a half an inch bigger overall than the flanges on the my HKS DP, Kansai catback, and the factory cat. When I installed the cat I set everything as centered as I could. Apparently that lets the heatshielding in the drive shaft tunnel vibrate and hit the flanges just enough to make an incredibly annoying and loud rattle.

I loosened the bolts and pulled the cat away from the heatshielding as much as I could and this seems to have fixed it. My DP is only 65mm so I've got a little room for misalignment without blocking off any flow. I think I may still bring home my tin snips from and do a little trimming to make sure there will not be anymore rattling.