suggestions needed

I recently purchased a 2007 mazda 3 s touring with the 2.3 liter engine. It is a great car so far but i want a little more performace out of it. I need some suggestions on what modifications i can make to it without voiding the factory warranty. I'm looking at a typhoon intake system but i do not know wich exhaust to go with. Any other suggestions would be greatly appreciated.
 
                                  Thanks

Hi the typhoon intake system is a great choice as for exhausts Borla and Supersprint are the best that I have tried.

Any aftermarket jazz such as intake and exhaust would void your warranty. The Mazdaspeed accessories have some pretty cool products, although they're more coin than the aftermarket stuff, if installed at the dealer, it will retain your warranty.