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Originally Posted by DRW1000
I think you are referring to the IMRC motors. The purpose is to change the intake path to a shorter run at an RPM of 3450 (?) or so. The theory is that long intake paths promotes torque (which you desire at low RPMS) and short intake runs promote hp (which you want at higher RPMs).
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Thank you for the information. Your explanation helps to understand my problem...