First of all, while not a professional auto mechanic, I am a professional aircraft mechanic with an FAA license and consider myself fairly experienced with cars. I replaced CAT on my 2003 Toyota Solara due to OBDII code 0421 (inefficient catalyst bank 1). After installing this collector, I was able to clean up my code and it successfully passed the outlier tests. I was pleased with this item primarily because of its price. I considered buying the original header, but the lowest price I could…