I'm sorry, but there is no way a 4-dr jetta that weighs almost 3000lbs can do 0-60 in 7-8 seconds with the base 2L 95whp motor (115hp)! You only got Intake
plus you've added some serious weight with your stereo system, plus I think you had your buddy in the car too. Your method of timing is highly inaccurate. We can't tell if your going downhill or what either. Heck I can drive downhill and show you a 3-4 sec 0-60 on my celica too. Find a flat straight-away and borrow someone's G-TECH meter, and show us a video of that in daylight, then I'll believe it.