This.
Without switching fuel on 18+ you're not going to gain much with a tune unless you add long tubes to the equation. That would definitely merit a power increase. I would still say skip the cai unless you're going with a closed box design to keep iats down. But not much to be had with the cai unless going more for looks.
My gas stations local don’t offer 91
It's per area. 93 is better than 91. My area has 93 everywhere but 2 hours west and I struggle to find 91.
A 2019 car has 5 years/60,000 miles of powertrain warranty most likely ending in 2023 if you got it in 2018. That's still 2+ years of warranty that you would be giving up by doing a non FP tune which might gain you a few extra hp on 91.
How much is a tune from Lund/PBD/AED plus the device itself? I figure around 700 or so which is only a 250 less than the FP tune for an extra 2+ years of warranty. If you pop one small part that gets covered by warranty in the next couple years, that will easily pay for the difference.
This right here. I honestly just want to add 4.09 gears in my '19 Gt 6 speed. But because of rev-matching and changes with 19+ - it's not a straight swap like older S550. So I need to change the gear ratio in the tune. I do not want to add a "cold air" intake and tune, I want to wait until E85 is more readily available in my area.
You'll be happy you did. What Dfeeds said - snappier and more consistent throttle response everywhere. The same sweet pull at high RPMs as before, but noticeably better low and mid-RPM torque.