- Joined
- 4 September 2000
- Messages
- 335
Several months ago, I bought some very cool looking cat test pipes made of titanium. Well, I installed them the other day as I was installing a Lightweight exhaust. My intention was to save a bit of weight by removing the cats. Anyway, after about ten miles, the check engine light came on. I checked the error code, and sure enough, it told me that both of the now nonexistant cats were functioning below threshold. By the way, the test pipes had bosses for the 02 sensors, which I of course used. Moral of the story -- the removing the cats will indeed trigger the check engine light, at least on my '01.