I noticed that Partshopper has introduced a new product called Topline. They basically a knock-off of Magnaflow with Magnaflow's permission. I was wondering what you guys think of this company b/c the cat-back's are stainless steel and very cheap ($330). For $330 I can get the Topline system with Magnaflow mufflers or Magnapack Mufflers compared to the $460 magnaflow price. I just want to know if they are designed the same and if they would perform and sound the same.