Quote:
Originally Posted by Jeremy5848
The 6-cylinder engine is quite different from the five. The six cylinders are 'paired,' which allows the use of resonance techniques. You can't do that with five cylinders, which is why the 605 doesn't have flaps. Additionally, with five cylinders, getting reasonable smoothness becomes more important than a few horsepower.
Jeremy
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You can, it would just look very different. Volvo NA 5cyl from the early 90s.
I suspect the 4 and 5cyls were built to a budget and they weren't encumbered with as much emissions equipment as the 6 shipped to the US.