The it's not going to make a dif. if you get a GRS or not, it might go up a little but not that much. I just found out if you do any mods the insurancs company don't care as long as it is less than $1000.00. I just got in a reck and I got lucky that the only thing that had to be replaced was my intercooler. It was only $640.00 more added on to the bill. Insurance mostly has to with your driving record and age.