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The 3 stage intake manifold for the N52 off of the 330i/530i is a good HP bolt on. Its plug and play and would make your car 255hp and 221 tq (~25hp and 21tq).
There are some other good tuning options for the engine on top; like an aftermarket tune (10-15hp) MILVs (10hp w/ a tune for Milvs), secondary cat delete (5hp), headers (~20hp). There is also other options like the euro IAT, secondary intake feed and charcoal filter delete (those are undocumented hp gains)
Bimmerlabs may have a free re-flashable tune for the 528i; if not send them an email and see if they offer one.
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