There are several big power turbo builds running 1000+ hp using one plug. Don't some of the heads up series add extra weight on 16 plug engines? The class I race in adds 50lbs to dual plug applications. There are two or three people in the class running a 3rd gen Hemi and they claim it's unfair and would run the same with one plug BUT they haven't tried it yet. I would bet it changes their tuneup -both fuel and timing - and I'm betting power changes too. Just FYI, these are >2000hp engines on methanol.
Cruiser: 66 Dodge Coronet 500, Indy SR 440, Gen 7 Accel EFI = 11.38 @ 116.
Racing: Brand X, X275 Procharged Smallblock on M1, Leafsprings, Holley EFI = 4.30 @ 168
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