Vac 30/30 Signature upgrades??

i have a vac 30/30 Renaissance mk3, looking to upgrade to the Signature Series.  Any members had this done, They wanted $ 2500 for the upgrades, anyone knows exactly the detail into the upgrades ( caps, resistors etc....)  Also, after the upgrades what are some characters differences?  Thanks for the advise?? 

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Rather than asking members here about the specifics of the upgrade, just call Brent or Kevin @ VAC.  They are both very helpful and up front about their work.

As far as to how they sound, sorry can't help you there.

(FYI:  I love my VAC Phi 300.1 amp, and I think I have found the amp I will be using for a very long time.)

Good Luck!