CG precision, Active Autowerke, Fabspeed, and Akrapovic are the only downpipes im aware of that do not throw a CEL. The reason for it is the use of higher quality cats, either HJS or GESI.
in my opinion, AWE looks better, MST sounds better. I don't know which one I would pick to be honest.
No info on the inlet being compatible with other brands, it has not been tested yet.
doing catless before the exhaust is a good plan to test the waters. my advice is to stock with an axle-back exhaust as catback tend to get raspy with a catless downpipe
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