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Hi all, I'm new to this as this is my first post...

My question to everyone is, is it possible to put rims and tires from a 2006 g6 gtp coupe which are 18s and put them on my 2005 G6 V6 base model that comes with stock 16s? Is this possible without modification and if not will putting the bigger rims on my car harm anything? Any input/advice is much appreciated.
 

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Any wheel from any stock G6 will fit any other stock G6. People run aftermarket 20" wheels without many issues. So yea those 18s will fit just fine in place of your 16s.
 

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They will work just fine, however some of the styles of 18s weigh more. Some people have noticed performance decrease. Nothing night and day, but noticeable. I put 18 Malibu wheels on my wifes G6 and didn't see any noticeable performance difference.
 
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