49 trim if u wanna get technical lol. 3" inlet 8cm^2 exhaust housing 49lb/min wheel thrust bearing design… non ball bearing. those are the specs of mine. it can have a 2.4" inlet and 7cm^2 exhaust housing as well or any variation of the above… Forced performance is also comming out with the HTA Green now that has a 3" inlet with antisurge ports and a 52lb/min wheel along with the 8cm^2 back housing… it spools as fast as my green if not faster…for $400 i can have mine converted to an HTA and make about 20whp more with faster spool.