Just received in my NEW Rush BIg Louie slip ons. on side had scratches. unfortunately, I did not read WestEnd motorsports return policies. Because I installed them to see if my bags would hide them it voided my return. is there any options out there to touch up the ceramic? even blend. a black sharpie perhaps.

 

A lot of black ceramic header paints will match well...

 

Have a look at high temp paint for grills...

 

As previous replies have said go for high temp paint and you'll be pleased with the results.

I was a tad heavy handed when assembling my heat shields and scuffed one piece quite badly but unless it was pointed out you'd be hard pushed to see the repair.
I used a VHT aerosol and a couple of seasons later it's still looking good.
For scratches you might want to consider spraying some paint onto a piece of cardboard and applying with a fine detail brush.