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Discussion Starter · #1 ·
I have ordered a stock replacement K&N air filter for my 2014 Duke 390....will I have to do any tunings or have to install the powertronic ecu?? ...I've seen many other reviews and it made me even more confused..what shall I do? will it harm the engine or do any change in performance if I just install the stock replacement K&N filter without any tunings? PLZ REPLY
 
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