Getting excited about this. 
Instead of buying a new GT I am thinking about spending a lot less cash on my Rocket to upgrade the engine with my up-date kit, your 2.5L kit, Lush cams/pistons and ad some high end front suspension cartridges. Now what exhaust could I use ?  I have the complete Staintune system off the 2005 basket case, but I think the header is more of a bottleneck then the TORs I have on.  TTS has their 50% larger tube header that fits under the stock chrome heat shields.  Thinking of using that.  comments.