I'm trying to put together a list of websites that provide case studies, below are all the ones I know of, if you know of any others websites or magazines then add them on. Thanks

Ukautotalk
Pico auto
Aftermarket magazine
Autoinform
pmmonline.co.uk/technical
Scanner danner and James danner.
James dillon and frank massey you tube channels.
Tiepie-automotive.com/en/articles.