Exhaust Upgrade - Damage the Engine?

Hey all,
Currently have a Subie 2.5i,
Was wanting to get its sound to resemble a WRX and the options in-which I have decided upon is.
1.UEL Headers
2. Varex Middle/Centre Mufflers
3. Catback (Magnaflow,Xforce)
Unsure of the exact brand/type of which way I''ll go (Any suggestion would be appreciated)
But just wanted to know would this setup (When Varex open/close) damage the engine? ( I persume power will change though.)
Thanks.
Currently have a Subie 2.5i,
Was wanting to get its sound to resemble a WRX and the options in-which I have decided upon is.
1.UEL Headers
2. Varex Middle/Centre Mufflers
3. Catback (Magnaflow,Xforce)
Unsure of the exact brand/type of which way I''ll go (Any suggestion would be appreciated)
But just wanted to know would this setup (When Varex open/close) damage the engine? ( I persume power will change though.)
Thanks.