N54: Power difference between catless DP, high flow catted, and stock catalytic

So i am looking at staying with my stock exhaust or high flow catted DP so as to be able to pass emissions. With stock turbos, and the usual FBO of DCI, intercooler, charge pipe and meth injection what is the differential in RWHP on stock turbos? I have JB4 and will be doing the BMS BEF using MHD flasher and trying to figure out if going through the emissions hell potential for a extra 25 RWHP? Or is 75HP which i doubt. I would say that with stock turbos the difference may not be much, certainly with upgraded turbos and 20+ PSI of boost then the catless DP become important. Has anyone dynoed with high flow cats VS stock? I saw a post that high flow cats vs catless was .5 PSI max boost so i cant see that being more than 10 WHP.

I saw this "I remember Terry saying on this platform its approx 12whp per psi" so high flow cat VS catless cant be much if its .5 PSI. would like to see if anyone has compared stock cats VS high flow.