I am told this will possibly reduce the cabin heat and maybe improve the sound a bit. Roe has 2 1/2" high flow units that are a bolt in with 17-22hp claimed. Partsrack has less expensive "mid flow" Random tech units that look like welding is required. Anyone know how these two compare? On a non Viperclub approved vendors site I saw a Random Tech cat offered for the Viper where it mentioned an installation kit was required. Could this be a different cat from the one offered by Partsrack? Anyone?