wing size help me out

[bluemod]

the fasttrack is going to run mods but there running ump,amra,and 602s all togeather. There wanting to make a 5in spoiler and a 8in spoiler and 602s have to run a 12in spoiler. Wouldnt a 12in spoiler kill the car more than help it? All opinions on this please

[powerslide]

you will have to really free the car up on entry, will probably be able to just about flat foot it around

[bluemod]

the car is tight as it is then going with a 12in wing whats the best way to loosen the car up for this. and what angle with the wing have to be at to get the best out it?

[powerslide]

what kind of rear suspension are you running now?

[bluemod]

im running a 4bar 4 bar setup. 9in rear with the lr clamped. lr 225 rr175 and this on coilovers