Honestly, how else are you going to compare exhaust systems? Reliable or not, these magazine tests are the only place you are going to get that kind of information. No one goes out and buys 11 different exhaust systems, and tests them on the dyno just to determine which one is going to go on their car. No private performance place can afford to do that kind of test just to show their customers what works the best.
I bought a ProChamber before I read this dyno test. I bought it because certain people said it was the best. The unfortunate downside was that the ProChamber had to be bent to fit on with
BBK headers. So if I had to do it again, I'm not sure it's worth the effort. I'm working on a whole new exhaust system for a customer of mine. I told him to just buy the BBK headers, with the BBK x-pipe. Not because I thought it would yield the most hp, but simply because I don't have a tube bender in my shop, and I know this will fit first time. By the way, regardless of how the BBK X-pipe looks, it did outperform the Dr. Gas in the dyno test, although I don't remember the exact HP numbers. I think the Dr. Gas sounds the best, because it is made with thicker tubes, which resonate the sound better. You all know my principle on exhaust though. If it doesn't sound as good as you want it to, it's because you haven't put enough engine in front of it.
Kurt