Join Date: Oct 2007
Car: 2005 Outback H6 3.0 LL Bean
Feedback Score: 2 reviews
I'm more a fan of the longer pipes on the aftermarket header than the short OEM Impreza one. I've never seen anyone who has installed the OBX headers on an Outback. Because they're intended for the Impreza, it doesn't appear that they'll just mate up to the rest of the stock exhaust. It seems the '97 Legacy GT guy had to do a little modification, but his setup was modified already.
From the looks of it, my Subaru has three catalytic converters--one immediately after the manifold pipes join, and two more down the line that are closely in series with each other, before the Subaru resonator. I guess my plan of action at this point would be to nix the front two and have my local exhaust exhaust shop weld up a pipe/flange to mate the headers with the one remaining cat. It will take that cat longer to warm up, but it's the best solution I can come up with, I guess. I am not subject to emissions testing, but keeping one of the original cats in the system seems like a nice compromise to me.
Then there's the issue of the rear oxygen sensor...it looks like there's a spot for it after OBX's "cat-delete" resonator, but I'm not really sure I'll use that piece in my setup. I can't think of any reason why I'd want it. Maybe I could extend the wires and have the guys at the shop install it after the my remaining cat.