Also consider...turbos quiet exhaust quite a bit plus the 1.6 V6 engines are limited to 15,000 rpm, but rarely exceed 12,000 rpm during a race due to the new reliability (three ICE's for a season or grid penalties) and the dreaded fuel flow restrictions. Plus, when the new engine regs were being considered, inline 4 cylinder engines were initially part of the discussion but Adrian Newey pointed out that a change to a V6 would enable teams to still carry the engine as a stressed member, whereas an inline 4 would have required a space frame. The same would apply to an I6. Additionally, it would be hard to imagine Ferrari embracing an I6 engine formula.
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