i ran 15-12 on the spacers but i wasnt zcp so you may need less. check with EAS or one of the other vendors just to be sure, since your wheels are little wider maybe a 12-10 is better for you. should be fine for the track although i dont like having spacers on track car if i can help it.
02 Tiag e46 M3|6MT|GC plates|MCS c.o.|GC bars|GC race control arms|GC bushings|BW eng. & tran. mounts|subframe kit|BW race shifter|BW Jaffster|Euro header|BW exhaust|K&N c.a.i.|Epic race tune|Rouge pulleys|Seibon CF hood|CSL bumper|apr gt 250 & splitter|ST-40|XR-2|SS lines|half cage|Recaro profi|Profi 2 harness|BMWpedals|BW studs|