Part RK-3912 Product Specifications
Product Style: Motorcycle Intake System
Street Legal In All US States: No
Air Filter Color: Red
TUV Approved (Europe): No
Air Filter Height: 2.188 in (56 mm)
Air Filter Material: Cotton Gauze
Air Filter Outlet Shape: Not Flanged
Air Filter Shape: Teardrop
Clamp Material: No Clamps Required
Clamp Style: No Clamps Required
Filter Material: Cotton Gauze
Inlet Diameter: 2.25 in (57 mm)
Intake Pipe Ports: All intake tube ports needed for the specified applications are included
Mass Air Flow Sensor Adapter Included: Mass Air Flow Sensor Adapter Included When Required
Mounting Hardware Included: Yes
Neck Flange: 2.25 in (57 mm)
Overall Height: 2.5 in (64 mm)
Replacement Filter: E-3333
Top Material/Finish: None
Top Style: Rubber
Vacuum Tubing Included: No
California Restricted: Not legal for sale or use in California
Height: 2.81 in (71 mm)
Inner Wire: No
Outside Length: 9.7 in (246 mm)
Outside Width: 6.25 in (159 mm)
Total Height: 2.5 in (64 mm)
Weight: 4.7 lb (2.1 kg)
Product Box Length: 11.56 in (294 mm)
Product Box Width: 9.5 in (241 mm)
Product Box Height: 4.5 in (114 mm)
Be the first to review part RK-3912
All I can say is most people won't believe this but then it's their loss...in miles per gallon that is. I Own 2 Harleys, a 1979 HD Sportster that several years ago I put a K&N air filter on and felt like it doubled it's performance, and a 1999 FLSTF Fat Boy. I didn't rest there, as a year ago I put a K&N on my 2001 Dodge Ram Quad cab Cummins turbo diesel and also felt the increase in performance not to mention the scream of that turbo that I had never really heard from the factory.
Recently two of my buddies and I went on a motorcycle trip to Stecoah, N.C. Before going on the trip I changed all my fluids and serviced the whole bike. I decided to buy a K&N air filter and pitch the stock one. They were riding a 2003 Honda Goldwing, a 2005 Harley Davidson Roadking and I took my 99 Fat Boy. Prior to installing the K&N my Fat Boy got between 40 & 43 MPG. As we went from fuel stop to fuel stop my mileage was as follows: 43 MPG, 47 MPG, 46 MPG, 48 MPG and 52 MPG EVERY tank after that. My buddies only mustered 44 -46 MPG. Most people would ask what about the weight and the speed. Well both my saddle bags were packed, I had a bag with 20 lbs. on my luggage rack, plus my TBags weighed in at about 50 lbs. The weight we carried was all about the same. The motorcycle weights were different, but not enough to warrant the major difference in MPG. Also mine is carbureted and theirs are fuel injected. As far as the speeds, we were cruising on the interstate at 70 to 80 MPH through a whole fuel run which was about 200 miles. Even when I was on the tail of the dragon, which is 318 turns in 11 miles, my mileage stayed at 52 MPG. All I can say is after over 1700 miles on that trip the K&N definitely paid for itself with the increase of 9-12 MPG.
So everyone has a choice. you can pay at the pumps or spend that money on the LAST air filter you will EVER buy.
Ronnie E., Glen Rock, Pennsylvania
I installed the RF-1020 on my new (at the time) 2005 F-350 Harley Davidson Edition with the 6.0 diesel. The fuel mileage went up by 1.5 miles per gallon after installing the kit. Now with 352,500 miles on the truck it averages 19 MPG on the highway and still has the original RF-1020 on it. I clean and oil the filter regularly and I expect it to last forever. The chrome cover fell off the filter almost immediately but that didn't seem to make difference in performance. Thank you for a great product!
Thomas Campbell, Clearwater, Florida
Since installing the K&N intake system on my 2003 Harley Davidson Fat Boy, I have noticed considerable increase in power. My Harley is the 2003 100 Year Anniversary edition and I have several anniversary parts on it, including the breather cover. With this K&N kit, I was able to maintain the use of all specialty features. The kit was very easy to install. I had it completely installed in less than 30 minutes. Thanks again and I look forward to doing more business with you in the future.
Kevin Bearden, Ocala, Florida