T-5 swap header clearance during removal/install?

I've been woundering if I'll have to loosen/remove my headers to remove my C4 and or installing my T5? I have the hooker full length headers #6901. Any experiances and advice would be appreciated. Thank you.

 

you should remove the passenger side one to get the c4 out. i dont know if they will clear the t5 with out modification.

 

and thats the worst one to get to... is that what you had to do?

 

Did everyone you know of have to remove/unbolt the header(s) or is it just recomended? Can it be done without messing with them? thank you.