I have driven both extensively ( the VA and the EZ ). I find that they both make about the same peak power when you use a boost module with the VA, but that the VA comes on a lot earlier in the RPM range. It seems to make a lot more power under 2000 RPM than the EZ. If you have an auto transmission the EZ will be gentler to it, if you have a manual the VA feels like more bang for the buck to me. Add a set of 275's or DD1's to either box and you have an awesome towing setup.