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I am extremely happy with the NPP exhaust.
I installed ARH long tube headers + a dyno tune and it made the NPP much, much more aggressive sounding and louder.
Stock, NPP was decent but I could have used louder. This was the perfect upgrade for sound + power. Now, I don't leave NPP on full OFF mode. When I want quiet, Tour is basically silent unless WOT. Eco is always silent. Sport has a perfect sound, although can get very loud under WOT. Track is just insane...
NPP is great for those who want to upgrade headers but not sound obnoxious 100% of the time. Its the best system IMO.
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