| Champ cars use two turbos... In the turbo F1 era, straight 4's used single turbos most of the time (a few played with sequential). All the V6's used twin turbos (although Renault experimented with quad) set up much like ours. The only time a huge single would be better is for drag racing and then you'd probably want NOS to reduce/eliminate lag.
Cheers, Ian 
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