i dont really know much bout either of these that well. i was curious which one would be make more hp and be user friendly for a stock cubed ls1?

 

I like the vortech myself, ya see more power at less boost, with your compression I thing you would like it better.

 

The main difference between the two is the charge cooling systems that are availabel with them. I have a Vortech, but it's just because that is what was available to me. There really isn't much difference. Some people complain about the tensioner pulley set-up on the ATI systems, and I've heard that ATI doesn't disclose any info about thier compressor maps, but both systems make similar power. The real variables will be the engines that they are installed on and not really the blowers