K&N Air Filters
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4th Gear
Joined: Jan 2009
Posts: 8
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From: NB Canada
K&N Air Filters
I've been looking at the K&N high-flow Air Filter kits for my FLSTF 2009 Fatboy. K&N has two types listed, the RK-3909 and the RK-3910. What are the differences between the two other than the HP gain and the height? I guess I want to know which one would be better.
Mitch
Mitch
Club Member
Joined: May 2007
Posts: 145,895
Likes: 821
From: 40 miles Northeast of Indy..
The (HD) SE K&N is different from the Lifetime K&N filter.
Don't have the no's in front of me, at my 15k service got a call that the rubber backing on the HD, SE K&N was bad. Asked about the warranty & was told that the HD, SE K&N is not the same as K&N's LIFEtime filter... $35 vs $50..
The HD one is washable, there was a recall in 08, the 07's were defective. They had both and Finally let me pay the $15 diff and got real K&N.
Don't have the no's in front of me, at my 15k service got a call that the rubber backing on the HD, SE K&N was bad. Asked about the warranty & was told that the HD, SE K&N is not the same as K&N's LIFEtime filter... $35 vs $50..
The HD one is washable, there was a recall in 08, the 07's were defective. They had both and Finally let me pay the $15 diff and got real K&N.
Road Warrior
Joined: Oct 2008
Posts: 1,321
Likes: 4
From: Rochester, MN
I've been looking at the K&N high-flow Air Filter kits for my FLSTF 2009 Fatboy. K&N has two types listed, the RK-3909 and the RK-3910. What are the differences between the two other than the HP gain and the height? I guess I want to know which one would be better.
Mitch
Mitch
"The latest addition to K&N's RK Series was developed to get more horsepower from your Twin CamŽ Harley-DavidsonŽ engine. Built around the legendary K&N High-Flow Air Filter, the new RK Series assembly includes an innovative powder coated billet aluminum backplate that eliminates external breathers and features a built-in, dyno-tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. This RK Series assembly retains a factory appearance by utilizing the stock air cleaner cover. The RK-3910 comes with a larger air filter and longer spacers than the RK-3909."
RK-3909 Specs:
Product Style: Custom Assemblies
Estimated Horsepower Gain: 7 HP @ 5000 RPM
Replacement Filter: E-3014
CARB EO Number: D-269-33
Weight: 3.4 lb (1.6 kg)
2009 HARLEY DAVIDSON FLSTF FAT BOY 1584 - 1-5/8 in tall filter
CARB Exempt: No
RK-3910 Specs:
Product Style: Custom Assemblies
Estimated Horsepower Gain: 12.05 HP @ 5000 RPM
Replacement Filter: E-3037
Weight: 3.7 lb (1.7 kg)
2009 HARLEY DAVIDSON FLSTF FAT BOY 1584 - 2-1/4 in tall filter
CARB Exempt: No
Given the information listed it appears that the only differences are height and HP gain, which appears to be 5.05 with the RK-3910.
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