Quote:
Originally Posted by Railgun
Not in a turbo'd car. Backpressure is the enemy in all cases. While exhaust scavenging is important, it's not as important as a N/A car manifold/rest of exhaust design.
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That's why I added:
"In practice: in all honestly you will not notice and I doubt that this is measurable thanks to the turbos and the catalytic converters. The flaps are there primarily for the exhaust note and at low RPM they remain closed to prevent drone as well."