GOS?

 

GOS performance, they advertise a compound turbo kit for 4k.

 

GOS kit doesn't cost quite that much.I have their HE351CW over a S474.It fits great and can support upper 700hp range.You still have to build a 4" DP and buy a air filter but the rest comes with it.I recommend them.You can build your own also.I was going to do this but,between work and family life my time in the garage equals about 8hrs per week if I am lucky.ED (engineering diesel)also can build you one but they are about $5500.

Also there is pics of the GOS system on my webshots below my sig.

 

The GOS kit is way to much. I built my own twice and didn't add up to what their "kit" cost. Once with a t4 s475 (don't do this for any big power) and the second time I used a t6. Check out my build thread in my sig.