Bro, if your gonna get a header(singular if you have a 4 cylinder), than you should also get a catback. It wouldnt make sense to open up the airflow from your exhaust manifold, than still have the poopty stock exhaust. Run 2 1/2 inch piping from header to muffler. Thats what I did and it sounded pretty damn good for a 4 banger.
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