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If I'm not mistaken your M104 is already pretty warm w/ a 7K redline..
A Properly engineered free flowing exhaust and perhaps a CAI would likely give you a few HP... Beyond that you are into $$$. If you want to sacrifice cruising/highway ability you could swap out from you 2.65 to a 2.82 or 3.07...
Beyond that forced induction is likely your best bet, but given the cam profile required to run 7K efficiently on an NA car you'll be re-profiling or swapping to a more conservative M104 camshaft before going too far.
Either way the above numbers are pretty spot on IMHO!
Jonathan
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