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I personally had the J&S and I did not like it.you have to cut your ECU harness and can not leave your car in the on position without it running or it will burn up your coils..Wait for the Utec..
I have had the J&S hooked up with my car on with no blown coils. Have there been confirmed cases of the J&S blowing colis? I have spoken with John, the J in J&S, and he states that it is impossible to blow the coils with his system, because the drivers are not powered when the vehicle is not sending the pulse signals.