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Im putting this set up together for a friend. He has a 1989 Mustang GT, stock bottom end with a E-303 cam, AFR 165 heads, Holly Systemax II intake with a Treadstone singke turbo kit with upgraded Turbonetics 66mm turbo, Evolution wastgate, Raptor blow off valve, Msd 6al, Anderson PMS, 42lbs injectors, 255 intank & T-Rex inline. I need to know what spark plugs are recomended and if the should be 1 step colder or not? Thanks any helpful knowladge is appricated!
 
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