1. What are the Pros and Cons of not using the 2 O2 sensors in the cat? There's a lot of "soot" in my exhaust, I think it's running a bit rich - think it might be a Lambda sensor? 2. Plug and Play ECU, Can I run it with my standard exhaust manifold and top mount cooler? Or should I wait until I fit the FMIC and manifold? Thanks in advance!