I went catless and I like it despite the little whistle noise. Currently tuning with Vit. My question to all of you with any catless DP is are your cars passing inspection? I don't have the smog test to worry about but when I bring my car to Honda for inspection next month they will not doubt hear the difference in the car, would they not check to see if there is a cat and then fail it because you need one to pass? Any input, personal stories or solutions would be appreciated, starting to worry I bought the wrong downpipe.