350 is huge HP for a VF34. Normally a TD05 smokes the VF34/35 easily, and spools pretty much the same. And a TD05 wont go much past 350.

That said, it all depends on which rollers etc etc.

A TD05 18G hybrid would be a good upgrade if looking to spend a few quid, or the 20G wheeled one.

Mark at Lateral Performance also sells some fantastic IHI based hybrids although they are a lot pricier than the oil journal TD range of Subaru turbo's