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?? 

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!