compression or flow?

Yes definitely he'll will want more gear this engine lives in the 5,000-7,000 rpm powerband.

Dyno ResultsDTS DynoTested at JMS
RPMTorqueHP
3,000392224
3,500390260
4,000424323
4,500453388
5,000463441
5,100468453
5,500464486
6,000453517
6,500434537
7,000397529