The "old" version is in a ribbed box while the "new" version is a smooth box. They had quite a lot of failures on the old. Hopefully, those problems are solved in the new box. The new box does not have the gutsy bottom end that the old one does. I ran the old VA for a long time. Loved it. Switched to the new and took it back off in 30 minutes and sent it back. Tried an EZ for about 5000 miles and now I sell them in my dealership. Most bang for the buck out there IMHO.....
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2001 2500 QC, ETH/DEE,4:10s, LSD, EZ with elbow(26. 5PSI)Stage 1 injectors from Carl, Boost/Pyro Guages, 4" Turbo back, BD Brake,Mag-Hytec Cover, Kleen Wheels, Energy Release, 70 gal. fuel, 20K Reese. 31,000 Miles on 03/01/01(Auto/Truck/RV Dealer)