I know that this sounds very hard to belive and every one will have something to say about it but , a friend of mine who owend a stock 88 mustang lx 5.0 was runnig a consistent 13.73 at nap and a best of 13.53 on slicks of course! the only thing that was done to this car was a home made ram air system no mufflers and no back or passenger seats!!
I don't remember the trap spped because this was about 5 years ago but I'll see if he still has the slips, I thought this was impressive at the time and I still think thats it's amazing bang for the buck if the 1/4 mile is your game!