You can crack a 6 character password in seconds on any normal computer using BTC recover, I just hope you used ASCII characters and its make your account save.
Otherwise, if you still fail to recover your funds as you forgot your password, then you can defer to a wallet recovery service, such as walletrecoveryservices.com, they will use a supercomputer to crack your password in exchange for a small portion of the balance.
You say "small portion of the balance". 20% (flat rate of the service) of 13 BTC = 2.6 BTC,
2.6 BTC x 11,500 UD = almost 30k
Sorry but 30k for cracking a 6 char password is akin to daylight robbery. Besides you don't need need a "supercomputer" for 6 chars...heck you probably don't even need a GPU !!!
@OP: I would strongly suggest that you use btcrecover. Other members have meticulously created how-to's /tutorials so I think you ought to fare well by DIY. Save your 30k its a shit load of money to be wasting for an hour or so of brute-forcing.