Evolution Motorsports used to do an ABS 930 air box that took a big old cone filter. They swore they spent a lot of time on it, and that not only was there more top end, but that the mid-range saw torque improvements. Imagine Auto had dyno runs agreeing, and used to sell them.
They were pretty popular in the naughties; I had one (sold it years ago with the rest of my CIS stuff); there certainly was a lot more room in the engine bay, as well as substantial weight saving.. Can't speak to any power improvements, as I changed turbo, intercooler and headers at the same time.
Here's someone else's for sale ad to give you an idea what they looked like
FS: EVOMS CAI for 930 Turbo
Good luck finding one; although EvoMS are still in business, they don't list any 930 bits 15+ years on...