Yeah dude, the Kooks setup is badass and it fits perfectly from what I hear.
And yeah, it would be cool if you could add up all of your mods--but no worky. Yes, it is better to go ahead and install all of your mods at once--I did the same. My CAI, pulleys, headers, e-fans, and 80mm BBK all had to wait until I gathered everything before I put them on... It freakin killed me to have those mods sitting in my garage for weeks!