man
when the cops do a general licence check, u wont leave withing 5 mins, regardless if u have a brand new corrolla or highly modiefied gtr.
just sit back, ive been pulled over in my car, which is a fair bit louder than ur car most likely esp on any sort of throttle, and driven away without nuffen.
watch your attitude, altho if u have a bad driving history, cops r usually assholes to u straight away, also doesnt help when u drive an import or hoon car.
i doubt u will get an epa notice, if u do, dont stress bout it. before u go to the epa, goto an exhaust shop, get it db tested, if its over, borrow a stock cat back, and ur set