I haven't really seen any documentation on them for the PT turbo, but a Mustang mag did an application on a blown 5.0 some time ago, comparing a new set of stock plugs to a new set of iridiums and the iridiums put down more power on the dyno. From what I have read, they have solved the early problems they were having with the electrodes on the iridiums.
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 '03 Inferno Red GT, 5 speed, STAGE 1, Mopar BOV, Plastic Intake, Modified Upper and Lower Airbox, Custom Airbox-to-turbo pipe, Borla dual exhaust, Maddog Short Shifter, Drilled/Slotter Rotors, Ceramic Pads, chrome wheels, chrome door spears, AMP chrome fuel door, PT Cruiser 3rd light diffuser, H&R Springs, Rear Sway Bar added, MGW chrome door lock pulls, Blane's hood struts, Custom license plate mount, some interior dress up stuff...more to come
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