no it won't cause any back flow problems.
would you gain horsepower ? probably not.
would it sound better ? that depends on what you like.
take the resonator off and you will get a drone sound in the cab of the car.
i had to put this on my car to get rid of the drone from my car
3" in and 3" out, but i also have Hooker Headers Aero Chamber Mufflers, not stock mufflers.
with the stock mufflers it should raise the volume some but the tone should stay the same.
rods789 at sbcglobal.net
PB 14.474 @ 96.248 PB 60' 2.168
180 therm k&n filter
3.33 pulley 3" cat back exhaust
custom solid front motor mount
custom 6" (BIG) intake
___WCBF '06, '07 survivor___