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Programmable EPROM Modules (PEMs) for use with the Shark Tuner on the 1987 and later Porsche 928.  These modules install in the LH2.3 and EZ-K ECUs and allow you to hookup the Shark Tuner via the network on the vehicle.  The beauty in these modules is that they allow for easy hookup to the ECU as well as simultaneous remapping and data logging of the fuel and ignition parameters.  Don't fight with opening up your ECU every time you want to Shark Tune...install the PEMs an enjoy "plug and play" hookup.  These modules make touch-ups to your .bin files a breeze.  Sold as a pair.