I purchased the Turbosmart 2.75" 45-degree hose, however it was an extremely tight fit. When I measured the outer diameter of my throttle body it was 3" however ,the outer diameter of the CAI was 2.75" so I have the Turbosmart 3" hose on order and I know it will fit much nicer this time when I get it as I did not like the stretch of the hose on the throttle body when I tried fitting the 2.75" hose.