Unfortunately, this has been found not to be the case. Something unusual has been found between G6's - two different air filters have apparently been used on the GTs but no real reason has been found.MHadden said:According to the 2006 Owners Manual that some cool guy sent me, the airfilters for ALL the engines (2.4, 3.5, 3.9) are all the same, AC Delco P/N: A1615C
Most of them actually come from the factory with an A2930C, even though the manual says A1615C. The A2930C is quite a bit larger than the A1615C. The filter that K&N lists on their site cross-references to the A2930C.