16G= Good street/autocross turbine. Lacks top end.
20G/FP Green/Frank series/AGP L2= Good Street/Drag racing turbo's.
60trim, AGP L2, T3 60-1 .63 A/R and bigger= Drag turbos.
Sites:
www.forcedperformance.net
www.roadraceengineering.com
www.agpturbos.com
Happy hunting!