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Header + tune won't add a ton of power. Car pulls to redline and revs smoother through the entire rev range.
15-20whp up top.
If you have access to E85 add another 10-20whp. You can feel the difference with an E85 tune over stock.
Catback makes noise, entirely optional mod, but worth it if you like and can live with the sound.
Beyond that you need boost or else you are trying to squeeze water from a rock.
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