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  #16 (permalink)  
Old 10-24-2011, 11:37 PM
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I can't say anything about the domestic cats. I have a Nissan 370Z that installing a high flow cat or ,like I did, test pipes nets you an extra 10-15hp to the wheels. It is about the same gains as installing a new cat back exhaust. Maybe Nissan just uses horrible flowing cars. My friend has knocked the cats out of 2 of his Titans and they both had noticable gains. I can't say what the actual figures were but we aren't emission tested in OK.

There are lots of diesels that run around here and lots have no cats. I know that the newer ones have problems if run with out cats but I don't know years. If it were mine I would find out when it got to be a nessesity. If yours is safe (I think it is) get some test pipes to replace your cats it you can. That way if you have a problem you can go back to them. My test pipes were $100 as aposed to 300+ for HFC's.

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Old 10-25-2011, 07:24 AM
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......Not to mention that #1 You will probably never notice the miniscule increase in performance and #2 The federal fine for removing them(should you get caught in a smog check) is somewhere over $2000. Is it worth it?
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