So I've read a bunch of the other threads but I have mixed information on the compatibility of the racing brake BBK and RPF1 compatibility. I thought that the RPF1 specific fitment kit was discontinued- however this one (slimmer version) seems like it would fit. I believe there were several iterations of this and from what I've read none of the other bbks will fit the RPF1 without some modification.

https://racingbrake.com/2023-k/

I have 17x9 +45 and im pretty sure I'd need a small spacer to run them. Considering eventually/also getting some 18x9.5 and figured they would have better clearance- but is it enough? TeamRX8 I believe you have used several versions of the racing brake bbk successfully.

Do I need a bbk? No. But i just picked up a mint condition 2004 with 15k miles on it (and factory original tires - crazy) which has been garaged it's whole life. Going to swap out the brakes and rotors and was thinking of powder coating the calipers (black or gray) and when you add the cost up its not thst much of a jump to a BBK imo. I will eventually get into autocross and would like to do 1 or 2 track days a year as time and kids allow. Plan to put 5000 miles a year on the car and swap pads for street vs track.

 

I had enough self confidence to modify mine down to the smaller 4-port 303mm size (SBK)
.