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Regardless of what gives the best gains I say sure do the pulleys.
A 3 pulley set is less than $150, takes 10 minutes to install, and can be done in your garage with no jack stands or power tools.
Sure it is not a game changer for the car but you will feel a difference in the responsiveness.
Headers and exhaust are great if you have the money. A exhaust with headers is going to cost you $2-3K and that is if you install it yourself. Then you need jack stands and ample time to do it.
I have already done the catback myself and will eventually get around to doing the headers and down/front pipe. Just need to get ready to spend $1k+ more on my car to do it.
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