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Removing secondary cats is a good start, but you may find it's not loud enough or provides enough of a growl. You also want to consider how much tolerance you have for the dreaded drone:
SWorks although it's a good price, has been known to drone.
Borla and Corsa do not drone from all indications
Also, as other's have stated Corsa does not have NPP, so consider how important that is.
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