I used to garage my M3 at Willow. Watched your video. After turning in at 3 and going up the hill, turn into 4 sooner. At 8, stay left longer before turning in. Stay a few feet off the apex at 8.
Saw a guy get killed in one at Buttonwillow Raceway. Flipped and landed upside down. Was at a NASA event. The roll bar did not save him. Personally, I prefer 10 point cages and a roof.
Lol. Been there done that with my other Mustangs. Spent a LOT modifying my last Mustang ('04 Terminator) prior to my GT350 and I'm done modifying my cars. My GT350 is great stock. Also sold my race car (M3). Yeah, it looks better. So! Does it go faster?
If you need more room for mods, I can see installing a smaller aftermarket unit. Other than that, what's the point? Don't really think any of the tanks look good. My original tank wore out so I replaced it with a new OEM tank.
If you know your stuff, you should probably know that "second generation" is no better than the "first generation." My 2016 GT350 has had no issues and uses NO oil (i.e., does not need any oil between oil changes).