anyone ever try one, power increae? Good quality?

Yep.
I think they were 1 5/8" diameter for a 3.2. I also bought his big s.s keg mufflers. I didn't like them so I went with a 911 sports muffler. My 3.2 has a maf with a steve wong chip. I have never had the thing dyno'd so I don't know what the end result is. Works for me though.
Buck

i've got a set with and run them with his beer-keg can mufflers. i had the headers ceramic coated ...

never had anything else, so i can't really comment on any power gain/loss.
but i can say that i really like the combo ...

Andy