Let me also say the DFA V3 would be the way to go. It does seem a bit pricey at first, but I was spending $130-$150 per week in gas, so my system will have paid itself off in half a year. I had 2 friends who did most of the installation for me, but it went in without any problems and has been performing without so much as a hiccup since then; I am coming up on 1,000 miles on this unit and I cannot believe,
I mean I really cannot believe, how flawlessly this unit has performed; I only wish I did this a year ago when I first started having to travel so much!!!