da man

hi every one. i am new here and hoping someone could help me with a noise my car is making.my camaro has lowering springs and sits low well i dragged the bottom and now i have a noise when i accelerate coming from passenger floor board. it sounds like fly wheel or transmission it is a 6 speed and has 80k miles on it i almost want to say exhaust is hiting drive shaft. but i got under the car and looked and didnt see any thing and checked u joints.it makes the noise mainly in 1st 2nd and 4th gear when accelerating and decelerating.but its worse in 4th gear any ideas or has anybody had this problem.maybe its not just because i dragged the bottom but it never made the noise until i did