Ok so from what i can tell AR are using the 3" street racer cats shown
here. These cats seem to be rated at 200 CPI.
The two options on the table are:
1. Upgrade to catless DPs + maintain/upgrade secondary cats.
2. Upgrade to catted DP + delete secondary cats.
At this stage I am leaning towards option 2, AR catted DPs and then maybe look at a custom cat back..
Hoping this way I loose 10hp on the DP and gain 5hp on the catback with a net of -5hp, while eliminating CEL, etc. This is probably a good daily driver setup and good for resale, and minimal impact in performance.