Quote:
Originally Posted by femaledog
Regarding droning on decel, why is engine braking so loud anyway? I definitely notice the noises the most on decel.
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You're engine braking since the throttle is shut (no air) There's no fuel from the injectors and no combustion. The RPMs of the pistons creates the vacuum and natural deceleration. Probably this creates the resonant peak or maybe even a stand wave in vibrations in aftermarket exhausts. OEM obvi sorted this out with appropriately sized everything