I currently have a Magnaflow Catted X on my Cobra and want to go catless I really like the quality of the magnaflow piece has anyone ever went to an exhaust shop and had the cats cutt off and pipes welded in place? Or am I better off just to buy a O/R X say a UPR or Magnaflow? What are your opinions or experience? Would I need a retune if i go catless?