BEST JEEP XJ EXHAUST HEADER
1984-2001 Cherokee (XJ) Headers | Quadratec
Crown Automotive Exhaust Manifold Rear Section for 00-06 Jeep Wrangler TJ, Unlimited, 00-01 Cherokee XJ & 99-04 Grand Cherokee WJ with 4 Engine $174 $190 Gibson Ceramic Coated Header for 91-99 Jeep Wrangler YJ, TJ & (Grand) Cherokee XJ, ZJ, WJ with 4 I-6 Gasoline Engine
4 headers and exhaust worth it? - Jeep Wrangler Forum
Feb 24, 2011The best headers for the 4.0 in my opinion are Dougs, Banks, JBA, and Borla. Couple a header with new, bigger piping and a free flow muffler and you should pick up even more. I'm gonna build a stroker this winter to drop into my Jeep in the spring, i'd love to see real dyno numbers from before / after your exhaust upgrade to estimate my gains.