It does seem to knock more at times than others so I suppose I should check which gas stations if any create the knock more. Someone mentioned that if a service station doesn't pump much 91 the octane rating will go down just from sitting in the tank. Also in a multigrade pump that pumps 87 89 & 91 octane all the gas in the hose, pipe, and pump etc is 87 if the person prior to you pumped 87 octane. Someone told me this might be as much as i gal. These are the reasons I added an octane boost as here in the country there just isn't that much hi test going through the hoses. Any opinions on this and adding octane boost.
Yesterday it was knocking some with me riding solo under slight strain going 52-55b in 5th gear. I figure the easiest thing to do at this point is put on the stock mufflers that the previous owner gave me. Hate to do that . I like the sound of the mufflers I have on, but it might tell me if I should invest the money for the TFI .