Collection: TD05 3" Inlet T3 IWG

TD05 3" Inlet Compressor Cover / T3 Inlet 2.5"/3" V-Band Outlet Internal Wastegate 6cm/8cm/10cm Turbine Housing

3 Options of Turbine Housing A/R: 6cm (.41), 8cm (.57) and 10cm (.73); please have a reference of which's a/r turbine housing best? 

And 2 Options of V-Band Adapters: 2.5" and 3" in diameter.