Really? When you accelerate? Only past 4000k rpm? Sound like this?

There usually is a upper and lower heat shield and the rattle comes from the two parts vibrating together.

But is could also be the HFCs that were mentioned earlier.

Honestly My hiss after 3k was Horrific.



Maybe it was a rattle, but i always assumed it was the HFC's

Hehe... I can't even hear anything wrong in that video, Clement... My Porsche exhust rattles more then that. LOL Is it more apparent from outside the car?

i did hear the hisssssssss around 4K rpm on that video.... I would safely assume that its coming from the HFC's since i don't have that hissss sound that your having trouble with.. i have magnaflows on stock cats

Yeah you can hear it more with the windows down, if you drive by some one i don't think they can hear it, just the glorious exhaust note. I guess I'm gonna try to get rid of the Y pipe with the heat shields and get some heavy duty flex joints on there and see if that helps.

Csquared, did you ever determine which exhaust component was rattling? I have the same issue with my HFCs.

It's the engine, with stock it muffles the sounds. So when you open up the exhaust you can hear it. I don't have my G anymore, I moved back to HK and got me a 370z and they also have the same problem.

I used to get this rattle even when I was revving up. I took it too a shop and put the car on a lift and we could tell that it was coming from the Y pipe where the pipes met.


So I cut it and put in a muffled X pipe. I lost the rattle on the way up, and muffled the rattle a bit with the revs dropped. I hope I helped.

Thanks. I wonder if changing the Y-pipe to say the Ichiba G37 Y-pipe will eliminate the rattle. Changing the Y-pipe is less hassle then a custom X-pipe setup.

Simple answer no.

It might move the rattle to a different RPM point, length or rattle might change, might get louder or softer. But nope it'll still be there. There was a guy on Myg37, changed a Y pipe and it was still there.

Ask anything you want I did a lot of research hahaha.

Don't folks that installed a full exhaust (HFC, catback) eliminate the rattle?

I think only the FI exhaust. Figured it was because they have no Flex joints sound is trapped inside the pipe then eliminated in the resonators.