I wrote to lingenfelter and this what they sent me back
Hello,
Thank you for inquiring with Lingenfelter. Sounds like you bought a great car!!! Our C6 packages will nearly mirror the 05 GTO packages, with the exception, that Corsa doesn't offer a cat back system as of yet for the 05 GTO. Pricing will be similar, but about $900 less without the exhaust. We will also offer Twin turbo packages for the 05 Goat, but unsure on pricing at this time. Power should be in the neighborhood of over 700 HP for the 427TT.
Just let us know if we can help!
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SOMEBODY IS GOING TO HAVE A PROBLEM SOON
Hello,
Thank you for inquiring with Lingenfelter. Sounds like you bought a great car!!! Our C6 packages will nearly mirror the 05 GTO packages, with the exception, that Corsa doesn't offer a cat back system as of yet for the 05 GTO. Pricing will be similar, but about $900 less without the exhaust. We will also offer Twin turbo packages for the 05 Goat, but unsure on pricing at this time. Power should be in the neighborhood of over 700 HP for the 427TT.
Just let us know if we can help!
SOMEBODY IS GOING TO HAVE A PROBLEM SOON