Asking what the finishing of the inside of the throttle body does for the car can be sort of explained by understanding why a golf ball has dimples. The golf ball actually has less wind resistance with the dimples than it does if it was smooth - crazy, huh? Same idea here. The machined patterning cut into the revised throttle body helps airflow.
John B.
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12 LS M6, IPF S/C, ASA GT-5 wheels, VMax PTB
1995 Mitsubishi Montero SR
1987 Dodge Raider Turbo Project
1986 Mitsubishi Montero 2.4l FI Transplant
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