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2012 Victory Cross Country Tour, Indianapolis
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I agree K&N filter or Victory performance filter does not necessarily mean you need to tune. Unplugged O2 sensors with the crappy air table Victory uses (on my 2012) would not be running very lean. Just based on my personal experience looking at the stock tables on my bike ECU. Your mileage and tune may vary. :)
 

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Yes. Anytime you change the balance in the flow of air in or out there should be an adjustment of the fuel that is put into that flow. We can get away without doing that in regards to the air leaving (exhaust) because it's not as critical to performance. Sure there's a bit of an impact that can be negative but unless the entire system is tuned for maximum performance, like in a race car, the impact is low. Incoming tuning makes a much larger difference because you are directly effecting the fuel to air ratio where too rich or too lean can not only cause performance problems but mechanical damage as well.

Just as a PS. In other vehicles I've run the K&N filters which are the same size as OEM and they are not going to pass as much air as a fully modified intake. Re-tuning would be nice if affordable but I personally don't think it's necessary when retaining stock sizes which is close to original air flow.

My 2¢ but I'm no mechanic.
Right on....well I have two performance ones that have life left and I ordered an OEM to have on the shelf just in case...so guess I will go merrily along...I rode up to Haliburton today nice 6 hour turnaround, was 80 F 20 C up there today other then the black flies when you stopped it was totally AWESOME!!

Stay Safe,

Rob
 
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