I finally got my S4 cover swaped onto my S5 block. When I bought the j-spec S5 all I got was the block. So I was planning on using my externals from the S4. Is this going to be ok to do? The only mods that I have done were the electric fan, greddy BOV, 3" downpipe straight through to 3" Corksport cat back exhaust system, 8.5 mm wires. What else should I do for performance mods and a way to keep it safe from blowing the motor again. Fuel pump?Injectors?Managment?????? Any suggestions would be great thanks.