Z-Tek exhaust - anyone out there have it on a 4.4?

[ForbesZ]

I have been looking around the net for a somewhat louder and more throaty exhaust for my 4.4, but I don't want anything that will rob me of power or sound like a Neon with a fart can. The Z-Tek exhausts look pretty good but does anyone out there have one of these on their 4.4? For anyone that does, what do you think of the sound? Like Dinan? Like Eisenmann? Like Remus? Also, is the build quality as good as it looks on the Z-Tek web site?

I had straight pipes on my 4.4 for a while, and while it sounded really mean, I had a very noticeable loss of power (and it was a little loud).

Any feedback is appreciated!