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4100 in 3rd or 4th? 4100 would be fine for 3rd gear and a little slow for 4th.
Get some cams, 1g throttle body, sheetmetal intake and turn up the boost.
Even at the same 20psi boost level, some cams and sheetmetal woudl probably make the lb/min go upward from 6600RPMs to revlimiter instead of leveling out.
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