Adam and I are kind of biased towards Bell Turbo. Adam has made 787hp on a mustang dyno with his USB and nitrous and has never had a problem. I have the WSB turbo on my truck, it puts out about 800 to 850 cfm with lightning fast spool up, and I've taken it to 60psi with no problems. If you need any info on them give me a call at the number in my sig, or pm me.