What Is It?: Thanks to the highly evolved electronic engine management systems installed by the factory on modern musclecars, we've got showroom stockers with 13-second capability, clean tailpipe ...

I have a JET Performance Chip forsale. Sticket says it fits a '92 4.0L. I put it in my '94 XJ and it worked great. Selling it since I sold the XJ, asking $200 OBO. Email me with questions/offers.

While HyperTech is currently the most advanced performance computer chip company, there are also a number of other manufacturers offering their own brand of silicon super-charging for late-model ...