The stock headers are quite good - you could get an aftermarket set, but it's probably not worth the gain for the price.
If you're not going to be tracking the car in hot temperatures, a pulley is not a bad idea. We also have software for those with a pulley to address the steering being too tight at low speeds caused by underdriving the power steering pump.
Our tuning information sheet is linked in my signature. Good luck with the mods you decide to go with!
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