Brian: Thanks for the info, saves me a trip to the shed to weigh one of those wheels. Was that the E0 or E1 wheel BTW?

Okay so plugs it is! I'm gonna go for the Bosch +4's as these seem most popular with CEGers. As a baseline I will throw the stock wheels back on and run Jeff in his Mystique again. We'll see how much of a difference the 18's really make then. Next will be plugs and a heat shield in for my intake.

Thanks for the input guys, any more ideas?