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Are you certain it's the OMP is shot? I say that because the OMP is usually pretty reliable and because old/worn out OMP wiring harness issues are more likely and will also dump you into limp mode. The FSM has a few procedures to test the OMP itself and troubleshoot the system's wiring. Assuming you've done all that and verified that the OMP is indeed dead, your options are:
1. Pick up a used OMP & take your chances with it
2. Send out your ECU for the Rtek v2.x mod, which gives you the option of removing the OMP (don't forget to run premix!) and cancelling the limp mode, along with adding some fuel/spark tuning capability to the stock ECU, for about $450. If your mods are not too wild (<300 HP), and your stock wiring & sensors are in good shape, the Rtek isn't a bad investment.
3. Go with a stand-alone EMS, wiring harness & associated sensors as required.
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