Originally Posted by somms

I ran FI catback exhaust and FI HFCs, along with a Stillen Gen 3 CAI without a tune on my daily driver for a year, no issues. I got an ECUTek tune because I wanted the racerom features and to be able to say I'm over 310whp, really no other reason.

I know everyone *says* you need a tune with three breather mods, but no one ever says *why*. From my anecdotal experience, I say don't stress about the tune. Get it when you want it, if you want it.