i completely disagree, if a engine is built right with the correct turbo on the engine, along with good tune and supporting mods, the power can be seemless, my 2871 setup has very little lag, i start making boost at the top of 1500rpm, see full boost at mid 3k (14psi)
if you were to get a sr20de, get mid to top end cams, and a disco potato, supporting mods and tune, the power would be near a supercharger spool, almost lagless
and when you say lag, what lag are you talking about becuase the 2871r holds till redline or above, so the small ammount of lag feel is imp worth it considering you are seeing a WIDE powerband, and not a gt30r or 35r powerband of a few thousand rpm or less of boost. this is full powerband power.