Just a question, turbine housing and exhaust housing are the same thing or different? I'm sure the VG30 single turbo is definitely bigger than the R34 turbo in certain ways, thus giving me more power as proven on dyno. Have a friend with a high flow R34GTT turbo put on dyno and my hi flow VG30 turbo on dyno, i have about 10 rwkw more. Not much of a difference though i feel.