I've reviewed this thread several times. There is a lot of great information here. I am moving toward installing the 62mm Karmen SC pulley (from Rudy), an SL55 high volume fuel pump, and larger 550cc injectors. The one piece of information I don't seem to find is where to get (what brand) are the recommended 550cc injectors. If they are OEM on a particular model Mercedes, I would like to know which model? Thanks for sharing your expertise . . .