Nice BRAT! I cannot help with CA emissions and I have no parts that would help you. Can you not just go with a basic Y and disable the sensors? The system is not complicated like newer cars and there is no elaborate ECU.
I will post your message on the forum at http://www.ultimatesubaru.org/forum/
(You should consider joining).
Expect some reply's from there. I'm sure it will get response.
In a message dated 8/27/2007 12:43:40 P.M. Central Daylight Time, email@example.com writes:
I acquired this brat while at a auction. The story was that after the original owner had the dealer replace the motor with a factory new motor
at 105,000 miles in 1987, they put it on blocks to do some brake work and there it sat with only 3500 miles on a motor and years of no attention I managed to start her up and drive all the way from Pittsburgh, Ca to near Placerville, Ca. NO brakes( Turned to rust powder) and some 2000 dollars later this little truck took on the Rubicon Trail! Now I have run into one major problem, The " Y " pipe is the California feedback type and I have searched three states trying to find a replacement, The muffler shops here want almost 1000 dollars to fabricate a exhaust system, cause of the O2 set-up. Can you help me with this?