Just got done replacing a used Magnaflow catback with a new invidia N1. With the JDL bits in front of it, it's wonderful, but holy balls it's loud.
The Magnaflow was "alright", I was hoping it would sound better once I got a full exhaust, but it was just loud and not really that great. It met my goal of "better than stock" and cheap (because I bought it used), but it didn't do the full exhaust justice.
That being said, if somebody wants an okay sounding catback, and are willing to swing by my place in Mesa to pick it up, it's all yours! Consider it my birthday present to you, stranger.
Nothing really wrong with it. The fitment wasn't as good as I had hoped, with the c-clamps there's a bit of adjustments you need to do before the length is quite right. But it's a 3rd-hand used catback with probably 15-20k-ish miles on it.