For the e46 m3, a wet nitrous kit was used and usually was a direct-port setup. When spraying high shots of nitrous, race gas had to be used. Nirous is very hard on parts, and for an engine such as the s65, which we don't know the limits of, i wouldn't use nitrous until we can see what these internals, the block, and the drivetrain can handle. With the s54, it was known that the stock block can handle lots of power, so people weren't scared to spray alot of nitrous. Also with the compression ratio of the s65 being high, to run a large shot of nitrous would probably require race gas.
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