I just installed a rb20 hi flow. so ill shed some light =)
First day i was very un impressed with power
but after about a week i boosted it to 12psi and its pretty good.
Has no trouble frying 10" wheels on the back.
Response is amazing to!! By far the best thing about it
Iv driven rb25 turbo r32's. The hi-flow is defiantly better, But it cost 4x more so it would want to be better.
but at least you know its new and tuff. Not a 15 year old ceramic rape victim.
hyper gear (who rebuilt it, and is a legend by the way) have said it will make an easy 200kw.
Well its not the best turbo for the money. But its still going to be more fun than a vg30 hi flow.Yuck.
I recon choose between rb25 stocky. Or rb20 hi flow if you got the cash. F**k the vg30.
good luck =)