well i just got back from the track and im really dumb founded and hoping you guys could help me shed some light on the subject. My best time tonight was a 14.1@100.86 mph and my 60 was a 2.1. No more than 3 weeks ago i was running 13.90s. The only things that i changed on the car were this: before getting to the track i put 2 gallons of 93 octane in(usually run 89) i had a 03 mustang cobra front bumper put on and i added my upr x pipe. Now how in the world did i not run better than 13.90? Here are my theorys. #1. It was really humid out. #2 the track really sucked. #3 my upr x pipe caused me to lose too much backpreasure causing a lack of torque. #4 my crappy driving ( i honestly really doubt this one considering i ran 3 14.1s in row this week and 2 13.90s in a row 3 weeks ago. So guys please comment on what i should do here and what i should worry/not be worried about. Should i put the stock h pipe back on? Im in limbo guys HELP