Got mine on Tuesday and installed it yesterday. Car feels much more responsive and lively, almost like the flywheel dropped a few lbs. Definitely louder than stock BPV (I'm running a Fujita CAI), with a sharper chirp or "whistle", finishing off with a slight "tink". Louder and more extroverted...
If you want a badgeless grille but can settle for fiberglass instead of CF for almost 1/3 the price, there's a guy in Canada that made a bunch up. I think he still has some left. He goes by SuperShyGuy.
Edit: I just checked and he has one listed on eBay. Same user ID.
MS6 wheels are also 2.5lbs heavier than RX8 wheels, 1 inch narrower (18x7 vs 18x8) and a PITA to clean (all those little spaces between the 15 spokes). RX8 wheels take less than half the time.
First thing I did on my MS6 is sell off the stock wheels/tires and put on RX8 wheels. Shinka's would...
+1
First time I drove the car hard (after putting on about 1600kms) I ran into what felt like a brick wall somewhere between 5500 - 6000rpm. It was so hard and sharp it felt like a fuel cutout (as when over rev protection cuts in). This was totally stock. I checked and found others had...
I just put one in my MS6 3 weeks ago, during the last oil change. It's the same size (dia and thread) as for other Mazdas. I got it off eBay for about $6 shipped from Hong Kong (bought 2, one for my brother who has a Mazda5) with combined shipping.
The bolt head is different (IIRC it was 14mm...