This downpipe is constructed of tig-welded 16-gauge 3.0” mandrel bent T304 stainless steel tubing. A 3.0” stainless steel Hi-Flo catalytic converter is built-in, stainless steel oxygen sensor fittings, and a stainless steel OE style flex joint into our design. The connecting flange is ½” thick, laser-cut, heavy duty plated steel. Dyno tested to give you a gain of approximately 10-12 WHP and 15-20 WTQ. This is a bolt-on two piece design, and downsizes to fit the stock system or our 2.5" performance exhaust system.