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Old 10-12-2009, 08:46 PM   #15
NASIOC Supporter
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT


Originally Posted by RaceFaceXC View Post
more than 35k... but lots of things may effect the life of the cats. i would verify that there are no other problems before messing with the cats @ 35k. Have been using odd-ball gas or messing with the tune or anything?

I ran my CAT's until ~150K miles until I finished upgrading the exhaust and using new HFC's.
My wifes 99 Impreza L (2.2L) has ~110K miles on the OEM CAT.

Emission parts should last 100K + miles, this is a US Federal mandate!
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