Yes about as big as I have seen, a member here and customer of mine has installed a set to his 3rd gen..Massive brakes

 

Monsters.
is there anything different with the hub offset wise?

 

Nothing different with the hub offset, we are using the std hub (10.5 rotor) it did take a different bracket and flipping the rotor hat to get these to work however

 

I'm assuming that's an 18" rear z06 wheel he's got there?

 

19” Z06 C5 reproductions. Has 20” on rear.

 

Can ppl even use these to their effectiveness? Maybe with an actual warmed up super wide race slick? My regular c5 brakes with a race pad will lock up the fronts easily if im not careful. And they stop from 180 mph more than fine

 

It`s not always about one stop or one stop from a X amount of mph. Dismissing the greater number of pistons the larger rotor mass and larger pad swept area will continue giving repeated stops long after the smaller C5`s go away in an endurance situation.

 

Any proportioning valve recommendations?

 

I`d want an adjustable one in there, anything stock is going to be too limiting- generally when you take the front and rears and graft them you have a good balance to start with. Most full systems I swap I find wide open is where the valve ends up for dry weather

 

This is my car.

Can’t say enough about the service, support and quality of the parts that Scott provided to me in helping to make this setup work on my car !

I would highly recommend that anyone who’s looking to do any type of brake upgrade to their Thirdgen to definitely contact BBU and Scott !