Boxster "s" upgrade?GHL?
 

Hey guys this is my first posting on the board. I have a 03 boxster "s" and I love it but I thinking about upgrading the intake and exhaust for even more power. I was looking at an EVO intake and a GHL exhaust from tweeks. Does anyone have any input on these products? Particularly the GHL exhaust.

One more thing, will i have too have the ecu messed with or will it adjust the fuel/air mixture on its own. Thats what the o2 sensor is there for right?