...any thoughts?

Rear Brake Cooling Duct - 997.1 : Suncoast Porsche Parts & Accessories (suncoastparts.com)

 

Have you had any issues with overheated brakes, or brake fluid boiling?

 

I bought both front and rear from Suncoast. Installation is fairly easy and they have stayed in place. I would only see a reason for these if you do track driving, which I do. If not, they seem quite unnecessary. I guess you do drive on track?

 

I bought the gt3 ones. Cheaper.

 

No, not yet.
I do know that heat is the enemy to any mechanical device. If I can keep temps. down, why not.
They're cheap enough.

 

^^^ I would argue it might slow the paint fading/turning into a rock that looks like birds pooped on it as well. A couple track days and any red brembos I have had become brownbos.

 

If for no other reason it would be nice if they kept the brake dust blown out.