I sent a e-mail to Mo asking if I could install the downpipes first and then tune later to see what the effect each individually would have. He replied that the pipes alone would cause the car to throw a code. He says they can configure the stage 2 tune for the catless downpipes. Still waiting on the downpipes which are scheduled for shipment the end of this month. I never did get an answer from Mo on whether the stage 1 tune had enough flex to allow for the downpipes (except that it would throw a code). He did not recommend going to a colder plug for the stage 2 tune, just change them every 8000 miles.
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