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Here's everything in a nutshell:
- want sound? Catback
- want more sound and some power? Header + tune. Tune is 100% required when getting a header or else car will trigger a check engine light. Getting the car tuned will void your warranty (if you have one) in most situations. Net gains from this vary but average around 20 whp.
- There are many options available, nothing below $600 is worth buying. Videos are useless because the sound quality always sucks.
- Loud exhausts (muffler-delete) will drone, always. Never combine a header and loud exhaust unless you want the attention.
Think about what sound characteristics you want your exhaust to have; that will really help narrow down the choices. Also consider equal length headers vs. unequal length ones (EL = more high end power and flat sound; UEL = burble sound aka "boxer rumble"). Don't rush into a purchase and do a TON of research.
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