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I have some bose rip off noise cancelling headphones. They quiet the roar on an airplane and dull other noises but you can still hear everything. I cant imagine the technology could completely eliminate engine/exhaust noise.
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1994 Lotus Esprit S4 - interesting!
84 lime green back date (LWB 911R) SOLD 
RSR look hot rod, based on 75' SOLD 
73 911t 3.0SC Hot rod Gulf Blue - Sold.
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