question on the eagle 7port and 9 port motors<on-road>, is the stock version that much less of a performer/also im assuming the 7 is better suited to smaller tracks, i am new to jp motors also will a 2013 novarossi pipe work w/them or strickly jp pipes, wich works the best...5 min etc...i can tune with diff headersm but looking for best all around pipe for the eagle 9'r thanks in advance!

tommy