So let me get this this straight. I buy the Magnaflow muffler I want, model 12286 from Amazon.com for $81.81 and I cut the pipes on my truck and either clamp or weld them on the new muffler and I am good to go. OR......I pay $521.49 for the Magnaflow model 15809 cat-back system and I get the $81 dollar muffler and I guess $439.68 in pipes. I mean the picture on Magnaflow shows the exact same piping I have on the truck already. Please explain what I am missing.