I don't know what L8 sells but I installed a modular, bolt-together setup on both of my trucks. It was either Allmakes or Britpart, I forget which. Install is not too bad, helps to have a second person to maneuver stuff around. I pieced it all together, keeping all the intersections loose, then had enough play to finagle it into place. I recommend removing the rearmost exhaust hanger, attaching it to the pipe, then bolting the hanger back on. Grease the insides of the rubber connectors and bend the tabs to aid install (bend back when done).