Quote:
Originally Posted by Bogie
Borg Warner didn't design the turbo with sufficient bypass capacity to operate within its designed range? 
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It's a compromise. The OEM valve you refer to is particularly small, and poorly conceived in terms of airflow. It gets even more stressed once you turn up the power on the car, which of course also turns up the amount of airflow to be bypassed! Like many items on the car, the bean counters won on this one...it's barely adequate in stock form, and inadequate at anything more than stock power.