![]() Hypertech have the Max Energy Power Programmer for the 1996-04 Jeep Wrangler, Cherokee, Grand Cherokee 4.0L. In reality performance gains do not live up to the hype and there have been mixed reviews about this product. They claim a 10hp/18lbft gain at the rear wheels on a Jeep Wrangler 4.0L automatic. Stage 1 is for stock engines, Stage 2 is for engines with a low restriction exhaust and 180 degree thermostat. ![]() It intercepts the stock codes and replaces them with performance versions. JET performance manufacture a Power Control Module for '91-'95 OBD I Jeeps and for '96-'06 OBD II Jeeps that piggybacks between your stock ECU and wiring harness. The others require you to physically change a chip which involves unsoldering and resoldering. The JTEC is the only controller that can be reprogrammed. The '87-'90 4.0L engines were run by Renix (Renault-Bendix) engine controllers, the '91-'95 engines were run by Single Board Engine Controllers (SBEC), and the '96 and later engines were run by Jeep Truck Engine Controllers (JTEC). ![]()
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