How can i get the biggest HP gain in my acura tsx?

i have an 06 Acura tsx automatic and before you guys even start i know this car wasn't built for speed, but what can i get done to it to give me the biggest gain in HP and/or torque (besides the $3000 turbo or supercharger).|||Exhaust, airfilter, maybe put a chip in it. But the easiest way is just to reduce weight or put on a really good pair of tires.