Hi I wanted to get an advice from someone who had similar problem.
My bay 1 (passenger side) upstream 3-way catalyst broke up inside and chunks of catalytic substrate went into the downstream catalyst (they call it front exhaust tube I think). I was able to shake out of the downstream catalyst all of the loose chunks and debris, but I think air flow is still quite obstructed. The substrate in the downstream catalyst must have been clogged. While the air goes through brand new catalyst with ease, I tried to blow through my downstream catalyst and while the air went through I had to make an effort.
My question is what my options are at this point? Can I continue using somewhat clogged downstream catalyst? Should I replace it? What are other options? Can I hollow it out without affecting ECM, A/F control (there are no sensors behind it)?
Thank you!