Yeah, it definitely shouldn't sound like that (your youtube vid). We're assuming no damage was done to the exhaust manifolds or engine mounts while removing the stock cats? Did you visually inspect for any loose packing material/mesh inside the cats before installing?

That sucks man.. :/ hopefully you get your thing fixed. Mabuhay :D

i was talking about the brace that is in front of the back wheels. the pipes go over the brace.

We tried to shake the whole pipe including the hfc and it is pretty solid. Yup I visually inspected the new cats before installation, everything was ok.

No Mike, nothing is hitting against something. The hfc including the midpipe just shakes at just 1800 rpm. Other rpm range is ok though. As soon as I passed by at that rpm range it vibrates/shakes the pipes.

put stock cats back on and see if it still does it. If not then its the HFCs, return them and go with another company or get a new set. My ERZ and FI CBE are doing great.

^^ agree, if nothing is touching and nothing is loose its probably a defect in the hfc

Hopefully men. Salamat:tup: i will go back to the shop tomorrow.

I am also having an exhaust rattle, other than the hiss on decel. Its fairly similar and seems to happen more often in the cold. Im hoping its just hitting the cross member. I still need to investigate, however i have Berk cats not ERZ, and stillen CBE.

Mine, vibrates and shakes at exactly 1800rpm. The hfc and the midpipe next to hfc is shaking like crazy that you can feel it inside the car and shift knob vibrates at that rpm level too.

Update: My mechanic put the two vibration damper from the stock y pipe between the pipe from the resonator of Invidia and Hfc and it helps a lot. I still have a little bit of vibration but it is tolerable now. :tup:

http://i15.photobucket.com/albums/a3...o/DSC02543.jpg

Missed you at the last meet. I am interested in the invidia and would like to hear it. Lets meet up sometime.

Do you know where he got those vibration dampers? I'd like to try a set of those on mine, my Y-pipe has some serious vibration and hissing on the flex joints... been driving me crazy.

From the stock y-pipe... :)

I was working that weekend when you guys had a meet, that's why I didn't come. I am down for another meet again. Invidia won't let you down men. For their price, you can't beat that. By the cat-back itself, it is not loud enough for me but when I put some HFC it came alive (WOW) especially at WOT. It's just perfect. Some folks here had a review about Invidia read those too. Here's the video with hfc.

You can't get those hiss go away men unless it is obnoxiously loud. Try to put those dampers and see what it can do. I am surely for sure it will help a lot. efuseakay answered your question :tup: By the way, you can buy those online at Nissan parts

Thanks men :)