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Old 01-12-2013, 07:33 PM   #5
LRJet35's Avatar
Drives: 2013 2SS RS 1LE
Join Date: Nov 2012
Location: Eastern PA
Posts: 251
Yep the dual mode (NPP) exhaust has 4 tips, 2 each side while the standard exhaust is a reg dual exhaust with 1 tip each side. The dual mode sounds a lot more aggressive and opens and closes 2 out of the 4 outlets depending on power setting to make it quieter during cruise but louder and more aggressive at higher RPM.
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