Ok fellas I did alot of searches and no answer. I have an 05X which has 11.6" rotors in front and 11.1" rotors in the rear. I wanna upgrade to the coupe setup 12.6" rotors in front and 12.1 in the rear. Now I know I will need the caliper bracket but my question is Do I need the coupe calipers? Also do I have to change any brake lines or brake booster? Thank you in advance for your help.

 

If i'm not mistaken Kesh, i think the 05X came with the single piston calipers (just like the 03-04 sedans) If that's the case, then you'll need a full set-up, calipers,brackets, rotors, pads, and most likely lines.
-GP-

 

Grant your right it is a single piston. When you say lines what do you mean, because I already have ss brake lines.

 

The connection for the 06 brakes might be a little different on the lines. If it isnt then +1 for you. But yes, you'll need all the parts minus the lines if they work.
-GP-

 

Depending on caliper clearance, you may need new rims too!

 

nope, the 06 brakes clear Sevas wheels with ease.
-GP-