probably headers cold air intakes dont really do much unless you upgrade your exaust as well so id go with the headers then cat back exaust then a cold air intake acutally id rather have a regular less chance of getting water in the intake manifold
Turbo = headers, NA = intake. Increasing exhaust flow on a NA engine will reduce back-pressure and can be detrimental to performance whereas increasing exhaust flow on a turbocharged engine will enable the turbine wheel to spin easier = faster compressor wheel.
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