slim ballasts come in different wattages. I have a 35W slim ballast kit in my bike. Any ballast type will fit our bikes... there is a ton of room for them.
The kit mentioned for $60 is a steal.
Alex A.- stock HIDs for manufactures are 4300K. If you change to that color temp, it will take a cop with a lot of knowledge of our bikes to know they didn't come from the manufacturer that way. The Higher temps are a dead give away that it's an aftermarket kit installed, which is one of the reasons I went with a 4300K kit.
The higher temps are just for looks and actually give out less light.