my cobra only has x-pipe,cat-bac and filter and runs 12.82@113 on factory street tires.
with all your mods must be driver error or maybe alot of extra weight around the waste area.
Woah u need to take a serious chill pill... I was only joking, why would I say your car was slow when I have the same car? Hellooo??? Also my 12.3 run was @ 111mph cause i missed 4th gear, My car has 11's in it , and about the extra weight around the waist comment, too bad I weigh 170lbs, grow up