I finally decided to throw a few upgrades at my '05 G35 coupe, including a new exhaust setup from Stillen.

Unfortunately, the x-pipe section, that is supposed to attach to the cats, doesn't seem to line up at all.

It appears that each cat has a support bolt that allows for some adjustment. However, this is proving insufficient to allow the Stillen piece to mate up.

I'm just wondering if I've totally missed something here. Any help is appreciated.

Thanks!

 

I don't mean to insult your intelligence by any means, but are you sure the y-pipe is right side up? The cats are slightly angled that if it's up-side down, it won't line up.

 

Yep, it's the right side up.

I can mate it up to one cat or the other, but not both at the same time. It seems like one of the Stillen flanges might be clocked incorrectly. The bolts come very close to the hole (approx 1/8"), just not enough to go in.

Do I need to loosen the cats where they meet the manifolds?