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Imporve 2007 Lacrosse performance?

I have a 2007 Buick Lacrosse CXS with the 3.6L engine. What can I do to improve the performance? I'm primarily focused on acceleration then making it sound better.

What are some things I can can/replace/change that will give my car the biggest boost in performance?

I'd like to start with will get my the largest performance increase first then work my way down from there.

I've been looking at different air intakes but I want to buy whatever will give me the biggest performance increase first then spend my money on the other things later.

Links and product names would be helpful. I'm not a car expert or anything, I've mostly just worked on the electrical side of things. The car has about 250hp so I believe it was some potential that can be unlocked.

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