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First, why can't you count the NPP exhaust? You get a choice with LS3 that you don't with the Mustang. You can have a quiet exhaust or you can have the dual mode.
Now the problem with the L99 is that they have to keep it quiet because of the AFM. They sound horrible when they switch to 4-cylinder mode with a loud exhaust.
Besides, exhaust is easy enough to switch out to suit your preferences.
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-2013 Summit White over Inferno Orange 2SS RS- -2014 White Diamond Silverado Z71 Crew Cab Short Box-
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