Spec-D Tuning HH2-CHKE91V6-DK Jeep Wrangler Grand Cherokee 4.0L L6 Stainless Steel Exhuast Manifold Header Fits 91-99 Jeep Wrangler, 91-99 Jeep Cherokee, 91-99 Jeep Grand Cherokee Made of high quality T-201 stainless steel 6-2-1 light weight racing design Increase Air Flow, Results in Horse Power Gain Inlet: 1.5", Outlet: 2.0"