HP Cat for 87T

[Kenbo]

I have a '87 T-Limited with stock downpipe. Is there a High perf. Catalytic Converter available that will pass CAlifornia Smog Test?

 

[gofstbuick]

Any ARB approved 3-way-cat (TWC) should do. Our EGR systems are not back-pressure type, so you don't have to worry about a more free flowing exhaust causing EGR opening issues. I would be more concerned if the shop installs a universal high flow TWC, and cuts flanges out. That is what happened to me during one cat replacement. It took quite a bit of work to restore the flange to mate to my existing cat and return to a slip fit on the DP.I think I purchased one of the last two cat/exhaust brackets from the dealer, because they are no longer available from the dealer, but some vendors still have them. I currently have an ATR highflow TWC and it has passed very well for the last 2 inspections.

 

[Kenbo]

Thanks. I appreciate the feedback. The guy at the muffler shop was talking about a universal high-flow CAT so you probably saved me some future trouble.

 

[gofstbuick]

The universal TWC is not really the issue, but the mufflere shop needs to take the time to mount the flange to the cat and set up a slip fit for the DP. This allows your system to resemble a stock setup and if you decide to change to a jersey style DP (THDP or ATR303) then the set up will install without complications.