I have had the dash light up like a Christmas tree on my 07 TRD a few times. Toyota has now replaced both exhaust manifolds 2 times and has no idea what could be causing an issue. I spoke with some engineer for a bit, and he was swearing up and down that my intake and All-Pro high-clearance exhaust were the causes and he wanted to test the vehicle with factory parts.
I was livid. Granted, I had the dash light up in 2 months time after the first manifold replacement. I told him the intake was the FACTORY TRD one and that a high-clearance tailpipe will not affect the manifolds and failing cats. After a little back and forth he finally got it. Toyota has said they will replace the manifolds as often as needed with no questions. In short, they have no idea what is causing my cats to fail.