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To my knowledge the one big thing that is different in the U.S. cars versus ROW cars is that we have four catalytic converters while the ROW have two cats. The extra cats can be eliminated with a straight pipe and generally is worth a few hp. Downside to wliminating the cats is it won't pass the visual inspection part of as smog check and it may not pass the sniff test if one is done.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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