facts schmacts..... - Saab 900 Bulletin Board - Saabnet.com
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facts schmacts.....
Posted by chrisx (more from chrisx) on Tue, 13 Mar 2001 19:45:33
In Reply to: Catalytic vs tester pipe any dyno facts????, Tino, Tue, 13 Mar 2001 18:51:13
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who needs facts when snake oil can be bought..
the Stock cat is pretty lame and no doubt maxes out at stock hp levels. additionally an old one that is plugged up will definitely constrict the flow. I experienced that on mine b4 i went to a 3" and have seen it on other non saabs as well. ( my old subaru trubo had a clogged cat) a new 3" soundmax will probably come in close to a straght pipe. the only way to check for a bad cat is to check the press drop across the cat. a dyno run a little overkill for merely a cat removal, doubt you will get any hard facts. no guesses on your observation but pulse problems sounds mighty complicated for a guess. usually just plain old restriction, esp since it is an untuned system to start with.
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