a 3" vers a 2 1/2" brand x with factory air box compaired to the air box replacement type that pulls the hot air. The 3" pulls better mpg, top speed, better spooling of the turbo, runs cooler temp of the turbo, will post temps soon. 1/4 mile times are 3" = 14.85 . the same car with 2 1/2" 14.91, see the post on thispage dated 1-30-04 "AMX turbo to air box installed" by LAF and just so you understand different manf. make different intakes for the PT and the GT and we all can't look the same so you like brand -x and others like airaid, and others like the factory system. personaly the amx1397 is the best runs ths coolest and gives you more mpg and more power. see this post also, "BTG has a new intake"
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jim
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