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Message: <blockquote data-quote="leforte" data-source="post: 291395" data-attributes="member: 1943">supercharging / turbocharging the N52 is not going to be a costly affair. a slight modificationto the existing FI hardware to attach it to the block is all it takes. so the cost of physically attaching a FI unit to the N52 is not an issue. the construction of the N52 is not an issue either. the block is a hybrid construction of an aluminum inner block with a magnesium external shell which is more than strong enough for mild 5-8psi boosting with similar durability as any m54/m52 series engine.the main issue with FI-ing the N52 lies in the VALVETRONIC system. the N52 opperates without a throttle and its breathing is fully controled by the valves and cams in the cylinder head. in order for the whole setup to work, the DME tuning will be the main hurdle that challenges any tuner. most tuners will not be bothered (except for ALPINA) to take up this challenge due to the fact that the n52 is of a very limited production run and right now with the clear future of it being replaced by the new twin-turbo engines, its just not economically feasible. i saw a valvetronic e90 that was supercharged locally, and it clearly shows the local tuner knows nothing about the valvetronic system or tuning the car.</blockquote>