Before I install my 5 lug I have a question, is it nessary that I replace my brake booster/mc to a GSR/itr to support the bigger calipers? Going into a Honda Civic 2000 dx hatchback with stock bc/mc.

 

It will technically work with your stock master and booster but you will have a VERY long brake pedal. Like almost on the floor to stop the car. I have done it before. You should definitely swap the master and booster while you are doing the swap or you will be wanting to do it later for sure.

 

Is it a 13/16" or 7/8"? If it's 7/8" it won't be too offensive but you'll want to move up to a 15/16" or 1" sooner than later.