SVTs came with cone filters? Huh, did not know that.
There's no huge problem with the stock airbox, and if I could clean it up and fit a higher flowing filter in it as easliy as fab this, I'd go for it. This sounds better, though

Freaking A, guys, I cleaned it up! It looks fine now, the only part that wasn't nice was the top. I just bashed it down because I knew it would be covered.
I picked up a thermometer at Wal-Mart for under $10. It has a wire lead about 1m long with a tiny sensor on the end, records temps on the remote sensor and on the unit, and stores high and low values for each. It even has a light for the display - although the LCD must be held at an angle to read it with the light. Waddaya expect for eight bucks?
I placed the sensor into the airflow with my real intake temp sensor, through a hole in the accordian hose. It read spot-on outside air temps the whole way back. I currently have foam on the top of the box to seal it to the hood. With that gone, it went up 3-4*. That's not much, but it was measureable, and consistent. It's also a very small crack at the top of the box, so I think sealing is pretty critical.
I think it'll fit in a vacuum tap, so I might try this with the sensor in the UIM. I just have to make sure it can't get sucked in!