Stick with Motorcraft ASWF32-PP or the Autolite double platinum analog.

If you opt for Motorcrafts, DO NOT let the dealership try and tell you that AGSF32 is the suggested replacement. This plug extends into the combustion chamber approx. 5/8" beyond the ASWF plug resulting in stumbling at high rpm's (personal experience).

Art

2004 Velocity Red RX-8 *Racing Beat Intake and Exhaust *Grand Touring Package *Red/Black Leather *Fender Strakes *Rotary Accents *Xenon HID's *Bose