I do not know for sure yet as I don't have any of the newer plugs. When I talked to Reno about it he mentioned they help the engine idle better so it's very possible they are a hotter plug than the older style. If you look close at a C5TGC and a RB5 you will see the hole that all the coils are wound up in is a bigger hole on the TGC plug. Once the new stuff is avail here in the US I will get some and test them out.