I dont know what else besides a drop in replacement filter you could do without voiding you warranty. All the Mitsu dealers around here are blood thirsty when it comes to voiding warranty's. They void them over pretty much anything besides a drop in filter and a cat-back. And even for those things they will hastle you and try to blame for your problem if one happens to arise.

Good luck. You have to pay to play.

 

I would agree, go with the access port and try to find one used because they are really pretty pricy for such a tiny computer.