Stainless Manifold Header/Exhaust for 91-99 Jeep Wrangler Cherokee 4.0L L6 TJ YJ XJ Application:91-99 Jeep Wrangler YJ/TJ 4.0L 6CYL 91-99 Jeep Cherokee XJ 4.0L 6CYL 91-99 Jeep Grand Cherokee ZJ 4.0L 6CYL Made from T-304 high quality stainless steel Collector size is 2 1/4", the big tube size 1 5/8" and smaller tube 1 1/2". A direct replacement for the years and models listed. Increase High Flow Air, Gain 10 -15 Hp. / Tq. Increase the horsepower and torque on your vehicle.