I live in Australia and got this exhaust from
http://www.ebay.com.au/usr/lexusofnorthmiami
Lisa was great to deal with and super helpful with everything.
Anyways, i installed this a couple days ago and i really don't understand what people mean by "it's a quiet alternative".
It sounds AWESOME. People turn around to have a second look to see where that sound is coming from.
I don't know about any HP gains and honestly, i didn't notice any difference. It looks great(perhaps not with that diffuser) and sounds wonderful. I'd recommend it to anyone.
P.S. my right muffler tip is also very slightly slented inwards. I could perhaps get it aligned perfectly symmetrical in an exhaust shop but it doesn't really bother me and i can spend that money for something like an intake...