Quote:
Originally Posted by ember1205
OP specifically stated he has only seen the V4 indicator show up in online videos, never in his own car.
Yes, the ENGINES have AFM mechanical components in all cars, but the manuals lack the AFM actuators on the exhaust to create the necessary back pressure for when the car would drop to V4 mode. So, the computer has it tuned out.
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I must have completely skipped over that he said he saw that in videos.
while I agree that the afm actuators will help create back pressure. I dont agree they are needed for it to work. They do quiet the engine down also. When afm kicks in the throttle body opens up. I believe that they use the valves to help mask the sound so it is less noticeable. I may be wrong, but I do know its really easy to turn the afm valves off by themselves in the tune and not affect the afm from kicking in.