I just bought an AEM Pulley kit, Circle Earth grounding kit, Injen intake, Nology Hotwires, and Denso Iridiums for my S. Im going to install the plugs and intake myself, but im wondering if i should really install the pulleys and the Hotwires. I have found no dyno sheets with proven gains for either of them, and this bothers me a little, considering i spent almost 400 for the two items. Have any of you installed either of these (AEM pulley kit or Nology Hotwires)? I was going to get the unorthodox pulley kit but ive read that removing the crank pulley's belt pretensioner (i think thats what its called) shortens engine life, so i went with the AEM with no crank pulley. By the way, I am getting the Hotwires, grounding kit, and Pulley kit professionally installed, even though i know i could do them myself.