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904 engine = air cooled 2 valve heads
916 engine = water cooled 4 valve heads
So if it's got some plumbing and a radiator it's a monster S4 as these are water cooled using the 916 engine. If it's not got a radiator it's probably what the dealer told you a monster M900ie.
Can't help with BHP figures though.
Cheers,
Shandy
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