I have 19" volk gts offset 17 and 18. i currently have the tein s tech springs about .5 .7 drop, i wanna drop it more will this offset allow this?

 

maybe...depends on wheel width/tire size and how low you will be going...

 

the current wheel size in the back is 285tire size rim width is 10.5 and 9.5 i believe, i want a aggressive look probably like 1.5 inches

 

Definitely.

 

ive seen people with 3 inch drop with those offsets, those are the standard offsets for your wheels. 99% of people who have GTS have those offsets you are fine, you are also forgetting that after you drop it more your camber will cause the wheels to camber inwards like this / \ so you'll be fine.