right now i have 19'' 8.5 front 9.5 in the back with tein s techs can i roll 19'' with 10.5 in the rear? would i have to roll the fender out????? what is a good agressive STG rim set size?

 

For the rear on 10.5" the safe aggressive fit would be about +22. You could go to about +20 but it also depends on the tire size and brand that you are going to run on the rear as well. You could go more aggressive as well....though if you are going to lower the car then you might want to have some margin of error and buffer for tire movement and differences in brand sizes.

Then again you could run a 9.5" rear with a +12 offset. That would make the rim more concave assuming that that type of rim has that option based on the offset choosen.

Do a search on the my350 site as well. There are pictures of the people setups and fitment issues that they had if any.