Yes, Yes. That is yes for 2 reasons. The first is the most obvious, restriction. The UNI will let the engine breath better but you will also have to rejet the carb for you will deffinately be runnung lean and open up the rear of muffler to about 1". Now you don't want to gut it but just enlarge the 1/2" tail opening to 1". Second the air box currently on it , if not already leaking will eventually start by sucking air around the filter. This is where you wear out the rings.
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