http://www.greddy.com/upload/file/13-FRS_TK_T518Z.pdf
Check page 21 for modifications to the front bumper beam. The kit does require welding skills for the oil return as well. I wouldn't let either of those scare me away from purchasing the Greddy kit should that be the kit you prefer. Have you looked at all your options @
JohnAndFrson ? It looks like price is your number one concern.