Welcome to another modded dusk.
Why did you take off the npp? Sounds way better than anything aftermarket and proved to be one of the few that do make hp. Rather than just noise.
With LTs they sound even better than corsa and can still be turned to quiet.
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2013 2SS Dusk Edition
Dual Mode Exhaust CAI Inc CAI
Lethal Racing Stage IV+
PER 418ci Forged LS3