Hi FLOW CAT help!

dappadan786

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hi everyone.

im looking to buy 1 for my audi A4, B5. 1.8T ive seen one and it sais :

SPORTS CATS / HI-FLOW SPORT CATS

Fitment AUDI A4 1.8i 20v Turbo (not OBD) 2/95-2/01

what does the 'not OBD' part mean?

any help appreciated.

thnak you.