No the 182 decat is quite different.
I'll have a silenced Ktec decat for sale tomorrow. I'm after £80
http://www.k-tecracing.com/show_product.asp?id=1564
It's louder than a standard cat obviously but not as loud as a straight through decat. Quite a nice sound but it depends what exhaust you're running.
I find on youtube people usually have a straight through decat and no centre box.
I've got a Ktec system with centre box and back box so its fairly quiet still.
I'm fitting a 182 manifold and sports cat so I won't need the decat