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I was looking for a front lip, but everything I was finding was for the R3 bumper (RE Amemiya, Odula, etc.). I came across this on Yahoo Auctions. With the yen rate it was pretty cheap so I figured I'd give it a whirl. This is just a test fit, but it's pretty nice. It's three pieces. The center just slides over the exiting center section, and the sides mount from underneath and to the bumper in the back. I believe you can get the sides in carbon fiber as well. Since I couldn't find a picture of it on any cars I thought I'd share. After ordering it from J-Land I did notice they're up on Ebay now too.
I like how that looks! Do you have photos from any other angles? Searching for "aeroworkz" on eBay only returns 6 results, and none of them are for the RX8. Most of the 3 piece lips for the S2 look like they're coming from China.
I just took a look and they don't seem to be on there anymore. The Japanese site is https://www.aeroworkz.com/ and I'm sure they're just selling Chinese made stuff. I saw them on RHDJapan.com as well.