Say, Ronnie your car will run & sound great w/ your new exhaust installed! What are you trying to do by deleting the tumble flap's? You will probitley gain some top end, but at the exspense of lower end torque, specialley w/ your header & exhaust system. You have a 20 motor, so it's going to be more noticeably than a 23 motor.
Introduce Mr. Torsen to the mix
Bigger brakes then you- D23 crew- D-Tech- Sedan Revolution= #131