The difference with the 05 is not only the plastic manifold, but the PCM is programmed to take advantage of it. A 05 PCM cannot be adapted to an earlier car because the programming is different because of different sensors (yes, they may look the same but are not).
Like I said in the other thread, a NGK CS rep told a friend one thing, another told him something else. Both AGP and Psi-Fi recommend the NGK's at .028 gap. They have done must research and testing, whereas NGK made their plugs and gapped them to what they thought was ideal. Listen to NGK if you want to, but don't get upset with others because they are getting a smoother idle and more power by using a lower gap. This has been proven already.
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Black 2004 PT Cruiser GT with chrome accent package, chrome door spears, billet gauge eyebrows, chrome beltline, Autotechnica tail light covers painted body color, TYC by Elegente backup lights and GPS Navigation. Silver dragons on sides and hood. Stage 1! Spark plugs gapped to .040, and installed a set of Crane Firewires. BTG cold air intake, AMX1397\'s Turbo Up Charge Pipe, Boomba Racing BOV, Hallman Pro PX manual boost controller and Mean Green\'s Hyperground Solution.
http://mysite.verizon.net/vze247vu
http://www.ptcruiserworld.com/Junior
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