We make the turbochargers used by Ford, Mercedes and Toyota in the CART Fed-Ex Championship Series. We also supplied Renault, Ferrari, Ford and BMW in the F1 turbo era. Please forward these comments to Mark J. Cipolloni. I would add another reason why turbocharged engines are generally more reliable and cheaper than their naturally aspirated counterparts of approximately equal power.
Larger displacement means higher reciprocating mass.
Higher reciprocating mass at higher RPM results in dramatically higher loading on bearings, and reciprocating components. The piston must reverse it's direction twice per revolution. The connecting rod sees a spike in tensile stress at top dead center which is opposed by a compression due to combustion pressure at full throttle. When the driver lifts at maximum RPM or downshifts, this spike is at it's maximum as the connecting rod's tensile load caused by the piston's reversal of direction is no longer opposed by the compression of combustion. Beefing up the connecting rod just adds more reciprocating mass.