Quote:
Originally Posted by Apex1.0
There is a visual inspection, so you need to have some cats. The secondary mid-pipe cats should serve this purpose. If you go with catless DP, the DME will throw a cat efficiency code. You may be able to flash this away, but I am not sure that will still be OBD2 compliant. Your IM monitors need to be in ready status to complete the emissions test. This is why you have to drive the car some time after disconnecting the battery. Flash aside, there are other ways to deal with the rear O2, but again I will let you search that out.
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Thanks for the info, I think the Mazdaspeed group used an extender that screwed into the downpipe then the O2 screwed into that...just took the sensor out of the gas flow so it worked, but didn't throw a code.
I'll read up on it - good to know that the mid pipe cats pass the visual inspection.