bowflex

I was wondering if putting a front wind splitter on a fiberglass bumper would receive enough support, or if the fiberglass would either rip or break at the support rod connections. Also I have 3-3.5in of clearance in the front and was wondering how much lower my clearance would be and if it would be a good idea to raise my front end or if it would be ok the way it is. I was looking at submitting a custom request to APR Performance for a carbon-fiber splitter for my Silvia. Also if I add a front splitter, would a rear diffuser be enough to balance downforce between front and rear, or would I have to get a rear wing?