The only thing I will do is define what type of headers.
Shorty header-no tune adj
Long tube header-tune adj
Anything cat back is ok and will not need tune to be adjusted.
But do not exceed these pipe sizes
Si/so 3" max
Si/do 3" in 2.5" out
If you go bigger than these you will start to rob the motor of it's back pressure and you may lose low end torque.
Lars
