the p's are kind of a pain to get to fit. I had my mac longtubes that fit with a little massaging and 90 degree plug boots. I've had both and the gt40 setup is alot easier to install.94GTcobra said:Im going to change my cheap e7 to gt-40 but some people tell me to go with GT-40 not the GT-40P. they say you get problems with burned up spark plug wires. Also anyone has some extra ones for sale.