Substitute the JB4 from http://www.burgertuning.com for the Ecutek tune, as it is a piggy-back boost control. And instead of FI Full DPs, just lower DPs from FI, HKS (resonated), AMS, etc. will be sufficient, too.
Running Ams downs and full FI catback and I notice a difference. Waiting on AMS intakes then im going to throw it on the dyno then tune to get a before and after. Just the downs with the vatback made a bit of a difference to me. 2020 Red Sport.
Talk to a dealership. If you're not wanting to void the warranty then that's your best bet. We've got one in Houston that will install everything in the RA 500 package (RA 500 Performance Package - AMSPerformance.com), with some less expensive parts, and still back the Infiniti warranty. Otherwise the small things like Cat Back and Intakes are safe to do yourself and not have to worry about voiding the warranty. You get into the tune on your own and the warranty is voided, that is of course if they ever were to find out.
I talked to my local dealer service mgr and she told me that the mods only affect warranty if they cause the problem. My heat exchanger, intakes, exhaust dont mess with anything so Im good. I like the JB4 cause I can set the car stock and remove it in less than 10min and they never know it was there.