Cadillac CTS V 2016-2019 Long SystemCTS V Owners have an opportunity to take that built in HP to another level with ARH's 100% U. S. made 304 S S header system. Designed to free up some serious HP by eliminating what's arguably one of the most restrictive factory exhaust systems ever, ARH CTS V systems will deliver the performance you'd expect, with the quality ARH is know for. The system comes with 1 7 8"or 2" primaries with 3 8" thick flanges and hand ported inlets, our trademark