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Bear in mind that the Japs use 100 RON fuel, or rather, have more access to it - as such, the ECU will be mapped accordingly to make full use of it.
As for 15 bhp with air intake, and exhaust changed to Mugen, inc. header, I'd have thought 20 would be nearer the mark.
With a limited run of 300 cars, you can bet the engine is the same - they'd not spend the money modifying it, but are probably hand-built blueprinted ones.
So in all likelihood, this is the same engine only highly fettled to pull those numbers out of it.
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