Is the car RWD? If so, going the performance route will be a waste with the power having nowhere to go. Get the M Performance LSD first and foremost if you care about real "performance." It will actually drive and behave like a sports car afterwards.
Then, after that, evaluate if the car needs more power. I personally find the car has more than enough for my street and track needs. I don't ever plan to modify my powertrain, but that's just me.
You can do a resonator delete/straight mid-pipe and you will get 90% of the benefit of a full exhaust. The stock exhaust sounds great, but it's just a bit too quiet. A simple resonator delete fixes that and really wakes up the car for minimal cost. The MPE is a great economical choice as well if you must do the full exhaust.
New wheels and tires will go a long way as well if you add power or push handling limits on the track. For stock power and only street driving, however, the LSD is a better use of $. Just my opinion.
Good luck!
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