Hi. I'm getting a 2021 CX-9 GT in a few days. I'd appreciate some help/advice. First, did I do good in getting this? I had a Mazda 6 GT a while back and traded it in for a RAM 1500. Up until then, that car was the best I ever purchased. I test-drove this CX-9 and immediately fell in love with it. Quick question 1: Can I adjust the tailgate's "fully open" height as I'm afraid it may hit the garage door? Quick question 2: How can I tell if the tranny is the "X" version or not? Quick question 3: Can I run 275 60R20s on the 20-inch rims? Quick question 4: What K&N engine filter model do I need for this? Amazon only shows compatible filters up to Mazda 2012 models. Quick Question 5: I need to hear my tunes and I'd like to do so without going thru my smartphone. I saw that the Entertainment center only reads USB 2.0 flash drives and recommend only up to 16GB capacity. It would have been nice if it could have played at the least FLAC files for non-downmixed multichannel audio. But I also have a large library of DSF files. And finally, Quick Question 6: Anyone recommend a good seat cover for these (at least the first and second rows. Thanks in advance.