Want to make your Shelby GT350 sound even more menacing while picking up some cheap horsepower? If so, the Lethal Performance Off Road Pipes are for you! Made from T409 stainless steel right here in the USA, these off road pipes bolt to the factory headers and X pipe without any cutting or welding, complete bolt on installation. All the hardware is included, however, you do reuse the stock clamps. Tuning is required otherwise the Check Engine Light may illuminate. Gains of 10 rwhp or more can be expected before any tuning, but with the tune, you can expect more as you can take full advantage of the freer flowing exhaust. Below you can hear how awesome this sounds with the stock GT350 exhaust both in Normal mode and Sport mode.