I would like to go down to a 15,16,17" rim on the rear and add the biggest racing slick that I can to alter my gear ratio to the lowest I can get it and still have a pretty big sidewall ( 3:50- 3:70 or so ratio?) strictly for drag racing, any info appreciated! I have seen wheels w/ 5 x 112mm x 17 with 36 offset but nothing smaller. And how big of a tire/wheel combo do you think will fit? I know there are alot of number crunchers out there, please help! Thanks in advance