Always search because there is a ton of good info archived on here. These things are discussed and debated frequently. From what I have read the gains from the intake are not significant. We have a cold air intake already that does it job very well. Some will advise against it, but I like the K&N drop in filter, just make sure you maintain it properly. I have always used their products and feel that a company doesnt stick around that long by selling a bad product. Thats a whole other arguement though.
Borla seems to be the popular for the exhaust mod. Twin pipes,cat back. I am not sure what your gains are going to be, but opening up the exhaust cant ever hurt.
Also I have read some good things about engine management and ECU upgrades. Maybe someone will chime in who has gone this route. I have not. Welcome. Cheers!
RE: Warranty. Always check with the dealer first, get things in writing or have them install it.