oil filter (2011)

K&N 153 for the Norton and luckily the Ducati uses the same ....
Craig

NAPA/Wix 1032
I believe I got those numbers from Dyno Dave site. Low restriction filters with no check valves inside.

I found '80's-'90's Toyota filters fit the standard oil Norton filter mounts. Regular filters only meant to prevent oil passages clogging not much for wear particles sizes. Harley filters fit Norton too and they offer 10 to 5 micron full flow filters to consider.

Wix for HD

Part Number: 57148
UPC Number: 765809571488
Principal Application: Harley Davidson Motorcycles - Black Spin-on - Has glass media - (Chrome version is 57348)
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Glass
Height: 3.404
Outer Diameter Top: 2.921
Outer Diameter Bottom: Closed
Thread Size: 3/4-16
By-Pass Valve Setting-PSI: 8
Anti-Drain Back Valve: Yes
Max Flow Rate: 7-9 GPM
Nominal Micron Rating: 5