As with any NA car, start with the basics. Get the air in and ou more efficiently. So exhaust system and induction for sure. Going further starts to get a pricier but you can look at tuning of the factory ECU, light weight pulleys for the engine, more aggressive cams, light weight rims (double benefit as it is rotational mass), a lightened flywheel (same principal as rims though can affect driveabilty for some). The list goes on and on and costs more and more lol if you're super keen you can look at engine rebuilds including an increase in bore size, higher compressions, forced induction etc, you're limited by your wallet so work out how much you wanna spend then go from there :) Good luck and have fun with it