Nitrous Express will soon be releasing a new system for the C6. This will also fit C5 Corvettes that are using a 90mm throttlebody and should fit the 2005 GTO (haven't test fit one on that vehicle yet). Part numbers and pricing should be available soon. They expect this to be ready to go in a few weeks. We'll have kits coming in as soon as they are available.
You can e-mail [email protected] if you would like to get in line to receive one of the first that become available. I'll post more info as we receive it. The kits are expected to start shipping in the next couple of weeks!