Here is my take. It is definitely your hard earned money and if it doesn’t meet your standard, then pass. That being said, you may be on a long, long journey to find a mass produced car that meets your standard. A softball size dent is certainly not acceptable. A new windshield is no big deal...
Why would anyone want 2-3-4 ounces or more of used oil spraying back into your intake? For such a simple modification & relatively low cost it is a no-brainer for me.
I think your frugality has already made up your mind. These are pretty easy options to make a decision ya or nay, so save your money and enjoy the 300 package.
I’m the OP and have the A10. There is a definite difference in downshifting in sport mode. Pretty aggressive and something I’m really enjoying as this is my first automatic Mustang.
I’m guessing because I babied the car during the 1k break-in recommendation there isn’t more in there. I kept the RPM’s varied as suggested but never really went past 4.5-5k rpm. Since the change I’ve redlined it a few times and expect to see quite a bit more at the next oil change.