Ok I now see that you have an hx35 with a hx40 16cm housing, correct?
I think that the 40 housing will act bigger because the hole in the center of it is bigger and has more clearance to the turbine wheel. FWIW a hx35 has a 58mm turbine wheel and a hx40 has a 65mm turbine wheel.
__________________
1997 Dodge 2500 4x4 Ext cab LB 5 Speed, K&N BHAF, 5 inch turbo back , plate MIA, AFC tuned, bd 64/71-14, SDX 5x16s, boost elbow, 4K GSK, ARP head studs, oringed head, valair 13" full feramic clutch, autometer boost and pyro.