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apart from the usual I/H/E, affecting how the engine and exhaust note sounds, what else can?

obviously, boosting is out of the question.
 

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Intake
Header
Exhaust
Supercharger
Turbo
ITB's
Turbo Whistle
Flux Capacitor
 

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also running at 88 gigawatts!
supposed to be 120 gigawatts


hell my fuel rail made a diff in the sound

had,
p2r fuel rail
fujita sri
kidd header,
s2 exhaust (now mugen)
and pullies
with injected motor mounts, putting everything on changed the note of the exhuast, just a little bit
 

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MOTOR MOUNTS! it only increases volume inside the cabin, not on the outside. people claim that the helix throttle body spacer gives your intake a whistle sound.
 

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apart from the usual I/H/E, affecting how the engine and exhaust note sounds, what else can?

obviously, boosting is out of the question.
Motor mounts will increase cabin noise for sure.
3" exhaust will increase exhaust tone outside of the car and will drone like crazy on the inside of the car.
 
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