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Yes. All of the above.
The invidia is pretty loud, not as loud as a single, but loud. None of them make significant gains, but if you want a slightly throatier sound, or just personalize your car, it's the way to go.
Throttle response, hehe, that's the catchword for all mods that make no gains since it is completely unmeasurable. When I hit the throttle, it responds... instantly!
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