Nice, really like your Chameleon serpentine belt....it blends right in with it's surroundings. Also, as you can see, even stainless discolors....whether it's plated or solid stainless, and yes I've used mom's fancy stainless steak knives to jump solenoids back in the day....yes they discolored and yes I got chewed out
The only SS headers that will not(should not) change colors are the ones made of tube-in-tube. It's double layer header piping, one pipe inside another, the outer pipe isn't supposed to get hot enough to discolor. The problem with running those is the outer pipe has to be much larger(takes up more space for install), and they're moderately pricier.