Wanting to raise the hp

[RocDoc]

Bought another yellow 04 conv. Want to add a few more ponies (yes I have horsepower envy now that the C6 LS2 is pumping 400). I am installing Berlanger long tube headers and a Corsa Indy exhaust this week. I am also installing a Vararam intake. Any suggestions as to what to do next. I am anticipating visiting FastTech for LS1 edit. Don't want to get too wild. I don't want to cause any problem regarding any warranty issues.