Are you going to pressurize the Seafoam into the intake so that it atomizes properly, or just do a drip type set up? I've used BG products to clean the upper injection system. I like BG's pressurized rig, yields better results IMHO, because you can vary the pressure as needed to give more or less as desired. There are even some systems that go inline and in place of the fuel supply so that the engine runs solely on the product used (Motorvac? IIRC) Whatever you decide, my suggestion would be to do the fuel system cleaning, then replace the plugs. That way, you're not goobering up new plugs. Speaking of plugs, don't cheap out on those!!! Use NGK or Denso's, both excellent Japanese plugs for Japanese vehicles. I know, I know, it may sound old-school, but... the Japanese designed the vehicle and the plugs they used in the vehicle, who are we to change the intended set up? (this does NOT apply to altering the suspension and such for uses never dreamed of by the original Japanese engineers <img src="/forums/images/graemlins/lol.gif" alt="" />)