If u 't' the black wire halfway between the plug and solenoid, then run that 't' wire straight 2 the body with good earth. U should notice the difference the first test drive. It will 'shot' off the line from a standing start quicker than prior 2 doing mod, plus there won't b a lift/ serge in boost from 4500-5000 rpm because it is already on the higher setting (due 2 mod.). Hope that helps.