Readin gmost of those threads gained me only one thing. It is a cheap and easy way to gain power. they stated that it worked with stock exhaust manifolds. not to mention plumbing in a modern engine bay with a v8. it may not be the most powerful, and it maybe laggy, but it does fill a niche very nicely.
I am intrested in the guy doing the dsc swap and comparing the two dyno graphs. It's the only real performance data on those threads. But dyno's shouldn't show lag.