ok so i thought about gettin some 15 in rims like draglites or something like them. would moving from 16 to 15in. mess my speedo up or anything else??

 

The size of the rim doesnt have anything to do with it.
Its the height of the tire that matters, you want somthing that is the same height or as close as you can to keep the speedo correct.
Heres a good refrence page.

http://www.sstire.com/tireheights.html

 

With all the PCM programming available, you can easly correct a new tire size, or different gears.

http://www.cardomain.com/ride/2189634

 

the only thing i'd be worried about is the 15" rims clearing your calipers on the rear or not. not sure about offsets or wheel designs but i do know that the old 15" Vette Rallys i have won't clear the calpers on the rear unless i use a 7/16 spacer. they are 15x7 4.5" BS.

 

go to the message board scroll down to wheels and tires and then go to wheel and tire faq it should have every thing you need to know!

 

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