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Dyno Chart

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On the Dyno
While we could have easily installed the JBA Cat4ward headers on our '00 Jeep Wrangler TJ and told you they functioned as intended, we decided to really put them to the test and perform a rear-wheel dyno to get some actual performance numbers. As tested, the Wrangler was equipped with an otherwise stock 4.0L I-6 engine. The Wrangler also uses the 32RH three-speed auto trans, NP231 transfer case, 4.56 gears in the stock axles, 35-inch tires, and a TeraFlex PRO-LCG suspension system. With the JBA Cat4ward headers in place, the dyno revealed an increase of 9.4 hp and 15 lb-ft of torque.