Needswings is reevaluating their SRT6 pulley mods. Per Rob, there have been some price increases that they are trying to manage. It is not cheap, but their strategy was to change 5 pulleys I believe. Price was $1,100, not sure what the future pricing is. I am not a mechanic, so I was intending on following mods designed by the experts. SRT-6.com has some basic info on their site regarding pulleys that I found beneficial.

Regarding paint, you can buy a Rustoleum or Dupicolor heat resistant paint for $10 +/- a can.

Update: Looks like Needswings updated their website in the last day or so: https://www.needswings.com/asp-178mm-kit-psk178 And, it appears that Needwings does not reduce the SC pulley diameter