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One problem with having any large turbo spool too fast on a small displacement car is surge. I am not talking about fake internet(bov) surge either. You could probably try to use VNT to spool a T88 early on a 2.0 DSM, but the turbo might destroy itself when it starts surging because the 2.0 can't take in anywhere near enough airflow at 4000 or whatever RPM. So you really can't have your cake and eat it too. Also a small exhaust side does make a turbo spool fast, but a small exhaust side doesn't make power. You probably end up with a high backpressure to boost ratio that doesn't end up making good power until your up into the area where the turbo should have naturally spooled anyways.
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