I have the 2 1/2" maganflow system on my car . Love it! You will love the sound! It assembles OK, you will need to "cut and paste/weld" to get it hooked up to the headers though. I had to fab up a couple pipes to get the correct bends. I bought a couplestainless mandrel bent 90's to make it all work out.
I decided to have a shop do mine after I got the kit and pre-fit it under the car on my back......definately not just bolt in scnario with headers....I was afraid to screw something up so...
I had a exhaust shop do it.
Then I had a second shop redo the install after the first shop screwed it up (had to get new header pipes and collectors.
Very happy with the exhaust, though a different sound with the X pipe than a traditional dual exhaust.
My wife thought it would be louder. For me, in most cases, just enough sound and rumble.
Thinking about cutouts though so I can piss off my neighbor.