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  1. Removing cat/pre-cat bad for engine/computer? 2.5L QR25DE

    Member Rides and Project Cars
    I recently was blessed with the "Check Engine Soon" light. always glorious right? codes come back saying my pre-cat is clogging. so, instead of replacing the pre-cat i'm going to put a header on (duh :rambo: ) So i was wondering if i NEEDED a cat on for the car to run without being too rich or...
  2. QR25DE 2002 SE-R Spec V - Pre-Cat Failure

    Engine Swaps, Builds
    Hi all, Before I get jumped on, I was looking through a bunch of the different forums, but I didn't see one over another that I should use, so I figured I'd start here. This is my first post, and I just joined. If someone can tell me a better place to post this who's more familiar with the...
  3. non fouler ?

    B15 Sentra (2000 - 2006)
    i bought i megan header to replace the precat. I still have the second cat futher downstream. will i have to do the non fouler trick and would i put the non foulers on the first or second o2 sensor?
  4. pre cat and oil

    B15 Sentra (2000 - 2006)
    looking for best answer possible. Car is consuming alot of oil lately. think the stock headers are still on. If I replace the headers now, does anyone think it will stop consuming so much oil? Or is it going to continue doing the same until the engine fails?
  5. 02-03 Oil cunsumption and Pre-Cat

    B15 Sentra (2000 - 2006)
    So my car has been consuming alot of oil lately. The oil light will keep going on and shutting off. Was reading a little bit about the Pre-cat stuff and all. Does this sound like that? If I get some new Headers would this elminate any further problems with this pre cat thing?