HELP!! Just fitted extractors, get too hot, melting wires!!!!

[Felony]

i just fitted some extractors ( they are unpainted, i dont know if this contributes? ), and they get way too hot, if the engine is cold you start it and withing 20-30 seconds they are so hot you cant touch them already, i thought the car might have the wrong heat range plugs ( as the car was on gas till i got it and im ripping it all out as i dont like gas ) after chatting with dellboy so i pulled one out and its a NGK R BRE527Y which repco told me are the standard plug for a ed 4 litre so i guess that rules that out? could the plugs be buggered? they ara bit black, very black actually, even a bit of black up the porcelin, im not sure what the problem is it cant be normal if the heat is going to start melting nearby wires and no they arent that close they are running along the inside of the strut tower next to the clutch cable which i have had to cable tie with them to keep it from melting too... a 10 minute drive gets the wires smouldering, lol, someone please help!!!! i also have a ef heatsheild i bent to fit but it doesnt cover enough of the extractors...
Thanks lads