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looking at it in terms of equal displacement/air capacity. 2 x 2.5 = 5L's worth of turbo on a 3.4L engine, compared to 2 x 1.8 = 3.6L worth of turbo on a 3.4 engine.
the smaller turbo's would allow for quicker spooling, yet still yield enough extra capacity to run higher boost levels on race gas or depending how low you go with the compression.
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