If you're on a DOCSIS system, no.
A small configuration file is sent to your modem from your provider. This file is what sets your caps and limits. It can not be changed.
Jan 2009 Update: Reports are that there are kits now available to permit this, however the legitimacy of the use of these kits is probably doubtful and you could potentially be penalized by your provider for uncapping the modem. [2kmaro]
Also see »Cable Users FAQ
»What if I uncap?
by wheelert$93 edited by 2kmaro
last modified: 2009-01-03 08:41:36
Caps are set by the individual providers. These caps vary from region to region and there's not much you can do about them.
If you uncap, you may be kicked off by your ISP. Uncapping is in violation of your ISP's Terms of Service (TOS). If you uncap, you can lose your connection and you may subject to legal action.
Don't do it. It's not worth all of the trouble.
by Lostintech edited by big greg
last modified: 2005-08-01 07:55:22