It suppose to give about 4-5mph in the 1/4. Thats good for around the 11.6 range =). But we will see. And to be honest, i only know of 2 ppl breaking the LSD so dont get too nervous about it. And ET streets hook so just be careful but they are well worth it. I have been running them since about august everyweekend i think. LOTS of passes and street racing on them and only the problem today. I'm going to drain the fluid tomorrow and see if i can tell anything and will take some pictures if i find a problem :(.