Hello fellow Solstice owners. I am on season 3 with my stock '07 GXP and decided to add a few horses. From what I gather, the Trifecta tune and high-flow cat seem like the place to start (I went Solo catless-how can you get more high-flow than that?) While I wait for these items to show up so I can install them, is there anything else that I will need to complete the package? O2 sensors? I plan on breaking the old gal in for a while, but what would be the next step? New exhaust? Also, when the tune asks about the on/off, I get the cruise control on=tune on, but the other option is comp mode on=tune on. What is comp mode? Is this option added when the tune is uploaded? Thanks in advance for the help...I love my Solstice!