The exhaust was rattling on the cross member i believe. Just a few washers / spacers to give it some room, that should be all.

I'm planning of gettin the ark resonated HFCs but idk I don't wanna throw off any cels. Any persuasion?? Anyone??:ugh2:

Omg ive had a weird rattle ive been trying to figure out every time i hit a speed bump too! But i had originally thought it was the trunk latch, but now that i think about it......i do think it started after my dts install!!! The only place its rather close is at the Xmember, could u maybe tell us from front to back how many washers u used on each bolt, and how they were placed? If your rattle is gone it will work for everyone. I think i just used 1 washer and lock ring on each bolt, didnt really think twice about clearance and alignment because it lined up damn near perfect.......but that xmember is just a couple MM from touching.

Yeah at first i did think it was something about the trunk aswell haha.
I had a shop install it for me, am not sure how many he added in, but i do know they were just ring washers about 1 or 2mm thick. Just try to a few more, that should give it a little more room.

From what i heard about the ARK, a few members have said "No CEL yet" but still in a way, that doesn't mean it couldn't happen.

Oh ok. Oh hey btw richiivu your video of your dt-s exhaust made me buy mine :tup:

Ah so I add a fee washers to the cross member bar? I'll give it a shot. Anybody know what size washers?

I also have this exhaust and having same kind of rattling noise when I go over bumps. Now weather is cold, noise became louder. Thought it was coming from trunk as well. Should try washers. Anyone has details how to do it?

Just unbolt the crossmember and put about half an inch of washers on each one. I had to use a pry bar to make the room, but it made the rattle go away.