I see way to high of egt temps at wot it is 1700-1800 and 600-800 highway 80mph. looking at water meth kits to try cooling it down what is the best ones? I was also debating between watermeth or steed speed exhaust manifolds until i seen that u have to buy $700 up pipes for it. are there cheaper exhaust manifolds that will help lower my egts? i dont want to melt my pistons? mods are in my sig.