Jeff, you need to use the boost elbow that was furnished with the EZ. It should have a restriction built in, I don't know anything about a "plug". If it is just a pipe plug, it will probably over boost. It is hard to improve on the stock turbo with mild fueling mods.
I run the EZ with RV275 injectors on an 01' HO with the stock turbo w/boost elbow and max out at about 32 lbs boost, it never runs hot. This is with the factory air box and exhaust system to the resonator, then 4" after that.
"NICK"