You have a red car, I think they will look great in red. Who cares what people think. Most people will just think nice Porsche with red calipers. It could be a 911 for all they care.
I had black calipers on my RS4 that you couldn't even see. What a waste! I had them painted in silver to match the Silver duco. I'd also always liked the silver Mercedes AMG calipers and the lighter Audi Ceramic calipers so that was part of my decision process. I thought the red was a little too loud for my liking at the time and would clash.
But you have a red car so your car already stands out so much, red calipers will just tie things in a little better!
After all so many cars these days have red calipers, particularly Porsche's.
You will need some good quality Porsche decals so might what to check out:
Repair Caliper Brake Decals - Super Graphics F1
I don't see them listed by they can print anything you want and they also have an ebay shop if you want to purchase through there.
I say just do it!