COP4X4 can now build your new Hemi JK with an SMS supercharger that will add up to 250 horse! We made another breakthrough in Hemi JK programming that allows us to properly program every Hemi that we install. This supercharger can be installed on 5.7, 6.1 ,6.4 ,7.0 and 7.2 litre Hemi engines. An intercooler is built-in and the fuel system is upgraded. The cooling system is upgraded with our new Hemi radiator that cools 40% better than any radiator out there. We support all engine upgrades such as hi-lift cams, ported heads, big bore throttle bodies and higher compression. . Send your JK to us and we will take care of the rest. Our transmissions shift perfectly and are properly mated to every engine. The 545 RFE transmissions we use are brand new and beefed up internally to handle the horsepower. All of our products carry a 1 year warranty no matter what it is.

Cop4X4 can now install the 5.7 VVT motor. The new variable valve timing motor from Chrysler boasts 390 horsepower and will get better than 20 mpg on a fullsize truck. As always COP4X4 can add a 6 speed transmission to any of its Hemi conversions.

So you say you want a COP4X4 Jeep? Here are a few reasons why:

Crocker Off Road Performance is the first in the country to install a complete SSBC Brake System in the Jeep Wrangler/Unlimited. We use a six piston setup on the front and two piston setup on the rear. This brake system is the same setup on the cars you see each Sunday turning left, and is highly recommended with the Hemi SRT8 6.1 liter option. Another COP4X4 Original Design.

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