Quote:
Originally Posted by Mike Benvo
Technically anything past the pre cat o2's should not cause an issue.
But if there is some sort of exhaust leak at the post cat o2's due to the extenders, that could cause issues.
Hope this clears that up. When I say it's not good to use extenders, I mean that it's better to just turn off the rear 02 checking in the code. Sometimes the extenders will squeeze by, but I can almost bet you that youll get a cat efficiency error at some point during the life of the car, even with them installed. It might take thousands and thousands of miles especially with the extenders in place.
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Thanks for clarifying. Concur that it is not 100% and I probably will get it again. Although I've gone something like 6k miles I think now without issue. But every car is slightly different and so is each exhaust.
I think the fabspeeds + extenders are a nice option for people that don't want to mess with the software. But if you are going to change the programing anyway, then no reason no to disable the DTCs for the cat inefficiency.