Reddit mentions of AEM AE-20993 Dryflow Air Filter

Cheap, easy, and butt dyno approved:

• snorkel delete (free, but pointless without a high-flow air filter)
  
• AEM AE-20993 Dryflow air filter ($41 from Amazon)
  
• add an FSWERKS polyurethane insert to the rear motor mount ($13 from Amazon)
  
• lunchbox delete (ie. remove the muffler, costs about $20-25 to extend and redirect the exhaust pipe)
  
• enable Sport mode via FORscan (free if you already have an ELM327 OBDII USB adapter with MS-CAN/HS-CAN switch, though you would need to put in a SelectShift knob and possibly do some re-wiring if you wanted manual control over shifting)
  
  Are you going to turn your SE into an ST? Nope. But hey, you're spending about $80. You could throw another $462 at Tom's tune (comes with an SCT X4 tuner, which is why it's so expensive). It will improve performance; whether or not that improvement is worth the money is up to you. It might also help with shudder if you have it (and if you don't yet, you will, so get ready).

I went with this AEM filter because it's closed. Seems to work well + has the advantage that it's a dry filter so it's easier to clean.

The snorkel delete shouldn't really change the temp of the air coming into the intake, you're just taking off a piece that restricts the flow.