Funny you should ask. After a few mechanics told me I needed to replace my cat (for CEL PO420) I replaced it with this exact one. I'm still fighting the same code. More significantly, the difference in sound is what is irritating me the most. When I accelerate (generally after putting in 2nd) it sounds like there is an exhaust leak (hissing, higher pitched loud noises). It sounds fine when revving and not moving and the mechanic couldn't find any leaks.
I am also running stock exhaust BUT, after I saw how rusted the piping and flanges are, I decided to replace it with a Tanabe Touring Medallion...it's at the shop being installed as we speak, along with a new rear o2 sensor as the original seems to be acting strange from a volt test. At this point, I care less about my CEL since I'm inspected until next April....I just want it to not sound so shitty....so I'm asking the mechanic to triple check my exhaust manifold to make sure there aren't any leaks or that the new cat isn't vibrating against something....I will update you with what happens.
I keep hearing that aftermarket cats on our cars are a crap-shoot because of stringent emissions...makes me want to move back to Florida and put a fuggin test pipe on.
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