Honestly, you can't go bad with either choice on SLP or Magnaflow imo. I know each has their own personal preference and you can figure that out for yourself by checking out clips on youtube or americanmusles site, but both are quality pieces. Only suggestion when modding this car is DO NOT do things twice, basically don't half-ass pieces and get a lesser quality piece then only replace that part later as well. I wish the previous owner of my car had spent a few more bucks for an exhaust other than a pypes kit, but he did put on BBK long tubes so I can't complain too much.