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I got bored

For my own edification, I found the third factor in cat design. It is the flange design on the header pipe side of the cat. The options are spin flange and fixed flange.

Here is a good thread.

The rule is buy the cat with the flange that matches your header.

Maybe there are all possible combinations of

EGR/nonEGR, O2 Sensor/Non O2 sensor, Spin flange/Fixed flange

So 2 times 2 times 2 is 8
-Spencer






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New 1991 240, Which cat to buy? How do I know if I have EGR?
posted by  pittroj subscriber  on Mon Aug 25 15:16 CST 2014 >
  • New I got bored
    posted by  Supergoose9  on Tue Aug 26 23:33 CST 2014 >


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