I've got the va duration, works great towing so far, just had it a couple of months, I ussually tow with it on 50% with the cruise set, egts are not a problem unless you turn it up to 100%. The only time I tow with it on 100% is when I see a duracrap or powerjoke that needs passed on a hill & I have to watch the gauge or it will get too hot real quick. It can get too hot on 50% on a real long or steep hill so gauges area must. EEngle, another guy on this site is currently testing a VA pressure box stacked with a VA duration box on a 600. The hope is that a little pressure with the duration will help with the egt issues, I think the best thing that would help the egt would be if VA would ever get the timing portion of their box figured out, they are working on it but we've all heard that numerous times from several of the companies. There's a place in NY called Precision diesel, they have a website but it's pretty poor, you can get there phone number from it, ask for Danny. He helped me when I was looking. I am very satisfied with the power the box makes but the egt issue has me thinking and researching a possible turbo upgrade. I just hate to give up the quick spool that this little turbo delivers.