Robert- I'm upgrading the old remote to the R49, with the turbo cool-down timer, and upgrading to the twins program. Don't know where the cheapest place to get one is. I went straight to TST for mine. They are all pretty close in price. TST does have a deal on the FASS and TST if you buy them both at the same time. Also, the TST box doesn't do pressure. That's why a lot of guys run the EZ. The EZ does pressure only. What are you planning on doing with the truck? (Daily driver, towing, racing?) That will determine how you go about doing things. Lots of research before you buy will save you money in the long run.
Mark- The R49 should be able to be upgraded, but you'd have to call TST about it. They will tell you what you need to do to get it done.
Jim