DK Custom Products

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XiED Fuel Enrichment for EFI Harley's Plug-n-Play..More Details

Availability: In stock
Item #: DK-XiED-NR
Manufacturer: DK Custom Products

XiED Fuel Enrichment for EFI Harley's Plug-n-Play Stage 1 upgrade DK Custom cool your bike down and make it run better Sportster Dyna Softail V-Rod Touring Bagger DK Custom Nightrider

Dynamic Tuning For Harley-Davidson Motorcycles
Xtreme Inline Enrichment Device


A Cost Effective Alternative to an Aftermarket Tuner & Dyno Runs.

This Patented Device Dynamically Adjusts to Changes Made to Your Bike!

XiED's Will Cool Your Bike Down & Make it Run Better!


The Patented Plug-n-Play XiED richens the Air Fuel Ratio from 14.6:1 to 13.8:1 in closed loop mode.

Immediate Benefits:

  • Lower Engine Temperature
  • Lower Exhaust Temperature
  • Improved Throttle Response
  • Reduced Surging
  • Reduced Pinging




  • Touring  2007-2008
  • Softail  2007-2011
  • Dyna  2007-2011
  • Sportster  2007-2013
  • V-Rod  2007-2011

 Recommended for: Stock Bikes, & Stage I Bikes (High Flow Intake & Exhaust) Will NOT Work with Stage II, III, or IV.

Simple install-comes with instructions.  No tools required, installs in a few minutes.


2014-16/17 Model Note:

The FL-ViED-10 is the best product for all 2014-16 Twin Cam models.  

2014-17 Sportsters use the XL-ViED-14.


They work inline with your existing H-D Bosch narrow band 02 sensors and Delphi ECM to richen the fuel mixtures, adding approximately 8% more fuel to the engine in closed loop mode.

There is an indirect richening of the open loop fuel mixtures through the learning mode, or adaptive fuel value action built into your ECM.  This ensures the richer 13.8-12.5:1 AFR's are ALSO adjusted in heavy/full throttle operation.

 LINK to All Dynamic Tuners

I installed Stage 1 slip-ons and air cleaner and then the XiED's. The low speed hesitation is gone and it is running 20-30 degrees cooler.  Talk about a simple install-best $100 I've spent on my 2011 Fatboy! -Roger


"409” ignition wires provide continuous heat protection up to 600-degrees Fahrenheit

Posted by Stephen P Mullen on 10/1/2009 to HD Tech Notes


What do the 131/151 codes mean?
The codes are specifically listed as P0131 and P0151 codes. The description in the Service Manual is:
P0131    Front O2 sensor low or engine running lean
P0151    Rear O2 sensor low or engine running lean
The key point to look at here is "O2 sensor low" when analyzing what is happening with the XIED's in place. The O2 sensor produces a 0.0 to 1.0 Volt output. Any voltage lower than a preset threshold in the ECM can trigger the 131/151 errors. Lower voltage equates to a leaner fuel mixture in the eyes of the ECM. The XIED's take a higher voltage from the O2 sensor and "shift" it to a lower voltage for the ECM to read. In some circumstances, the ECM will see this low voltage as "too low" and trigger the code despite the fact that the engine is running rich enough. The IED's take advantage of this voltage shift to richen the mixture.
So the engine can be running rich and the ECM might still trigger the "sensor low" signal.
There are also other reasons that the ECM will trigger the codes that we will try to cover below.

Will these codes hurt my bike?
No. These are historic codes and are not active. As long as these are the only engine codes you have and you do not have an active Check Engine light on, they can be safely ignored.

Do all bikes get these codes with IED's installed?
No. Many bikes never see these codes. You could also have the codes and never know it. Unless you check the historical codes on your bike, you might never see these.

Do completely stock bikes get these errors?
 Completely stock bikes get these 131/151 errors on a regular basis as evidence that Harley has included a note to "clear and ignore" these codes in their Service Manual.

Don't historical codes mean there is a problem?
No. Historical codes only mean the ECM saw something it did not expect. If the code is considered a potential problem or there is a risk of damage to the engine, the ECM will turn on the Check Engine light. No such situation exists with the 131/151 codes. The Harley Service Manual actually notes that these codes should be "cleared and ignored".

I have read that these codes cause the ECM to revert back to open loop mode. Is this true?
No. The ECM will only revert to open loop operation if there is an active error code. Active error codes will cause the Check Engine light to come on. As long as you have no CE light, your bike will run in closed loop for normal riding situations.

When I take the XiED's off my bike, the codes go away. Doesn't this prove the XiED's are creating the problem?
No. It can be easy to confuse the installation of the IED's as the cause of the error. This is a normal reaction and quite understandable for the average rider. In engineering circles there is something known as "root cause" analysis. The "trigger" mechanism is not always the cause of a problem. In this case, the "trigger" is the IED's. The IED's do make the ECM more prone to showing these codes, but there are a host of issues that cause the codes. Harley has documented many of these causes in their Service Manuals. A copy of the specific section of the Service Manual is listed below.

Are there other things that can cause the error codes?
Yes. We have information from an EPA testing laboratory that there are several other issues associated with these codes. These are engineering issues that are deeply embedded into the HD Delphi ECM. Our information also indicates that Harley is aware of these issues, but does not have plans to create any upgrades to eliminate know problems.

Can you get rid of the 131/151 codes?
 It is important that a rider ensure that they have eliminated the common reasons for triggering the codes with the IED's installed. The primary triggers are exhaust leaks and loose O2 sensors. Even the smallest exhaust leak can trigger the codes. We have found that many of the bikes that have codes will get rid of them when they carefully check their exhaust system.

Can I just run my bike with the codes and not worry?
As long as you do not get an active check engine light, you can run your bike with the IED's. For any active check engine light, you want to have that checked to find out what is setting off the CE light.

Customer Reviews

Did 5he job Review by Boston Bob
Came in the Mail quick,was exact fit,bike runs cooler,and no more back firing,Was well worth the 130.00.. (Posted on 8/2/2023)
Works as advertized Review by David
My pure stock 2007 1200 Sportster Custom runs much much better now. Installation was simple but getting my fingers on the O2 sensor connection for the rear cylinder was a bit challenging. However, the resulting performance improvement was certainly worth the effort. This is a wonderful product. (Posted on 6/22/2023)
worth every penny Review by Jacob
I am new to the whole bike scene. I got my first real bike, 2007 Ultra Classic, and the first thing i noticed was how poorly it ran. Besides that the heat coming off of it was ridiculous. Under heavy throttle it would spark knock even with premium fuel. Under full throttle...well i didn't even want to go there since in sounded so horrible with the spark knock I was concerned that engine damage may occur. After doing some research i came across the Xied harness. I bought it and could not be happier with the result. Spark knock is gone and the engine now runs much cooler. Full throttle is now a joy to hear the throttle body gulping large amounts of air. (Posted on 5/8/2023)
Excellent fuel enrichment product! Review by dynagliderob
Bought the xied fuel enrichment device for a bone stock '13 XL1200 Custom. I don't plan on doing anything more than pipes/air cleaner so these little gems fit the bill nicely. Excellent instructions and super easy to install. Bike runs stronger on accel and no more popping on decel. A Great American Made product! Highly recommend for solving the "over lean" factory ecm fuel map settings to get your bike to perform so much better for a small investment! This American company cares and we all need to support them! (Posted on 2/14/2023)
Great folks! Review by Goodnews
These guys are always there to answer my questions. Great experience with them at all times. (Posted on 11/9/2022)
Runs like it should now Review by Jayson
Was having issues with a 07 1200 sportster custom I picked up about a year ago
Bike would not accelerate smooth through lower rpms and was also having a hell of a lot of decel pop
had replaced spark plugs fuel pump exhaust baffles and was still having the same issues so that’s when my research lead me to this product
First thing is that the install process was hella simple
After install bike fired right up no check codes idled perfect and was running better instantly took it on a slight test ride and the difference in how smoothly the bike accelerated was like night and day
It rides and runs 100% better than before highly recommend this product can’t wait to put some miles on the sporty now (Posted on 2/18/2022)
ZiED 2007 Sportster Review by Roger
07 Sportster 883, after market mufflers, stock air filter but slightly modified air intake delivery system. This is the second XiEd i've installed on two different Sporty's no problems. A little more power, spark plugs burn just the way they should. Like it.

(Posted on 12/30/2021)
Great Product Review by James
I put exhaust and a high-flow a/c on my 2008 xl200C. It was running very lean and popped even after a slight rev. After installing the XIED's, the bike is better than before, No pop, great throttle and the sound seems a little deeper. Cheaper than a tuner for a simple stage 1 upgrade. (Posted on 11/9/2021)
Instant fix Review by Steve
So as many out there, i got bigger louder pipes and after 30 min of riding the check engine appears and bike runs rough , starting the bike was also difficult, felt like the timing was off on an old car.
Did some research and stumbled onto these co2 adapters and figured i would give it a try since its rather inexpensive solution…Guess what? It worked like a charm.
I own a 2008 Electraglide. (Posted on 9/29/2021)
Works Review by Nick
I installed these on a 2010 FLSTN 96 cube Twin Cam. The difference is worth it, definitely have smoother power in low revs and the bike runs cooler. I don't think it 'pop's less on decelaration, but that's not why I got them. The only improvement would be sturdier heat resistant wrapping like on the stock O2 sensors. There's a small section of unshielded wire at the plug that is a weak spot. (Posted on 9/15/2021)
Well worth it Review by Total353
Fxdwg now running as it should,
Noticable improvement, recommended (Posted on 9/14/2021)
Excellent product Review by Oldman071192
08 sportster 1200 was running like crap without a tune, purchased these and the bike runs beautifully! Best money I’ve spent! They work as advertised. Buy them today I’d you have modified your exhaust and air systems. (Posted on 5/23/2021)
Instant Change! Review by edwin
After stage one breather with slip-ons I couldn't do a proper dyno tune with Cats, figured I would try these to enrichen fuel.
Instant difference: could even smell some fuel at startup, runs much cooler, breathes better, pulls stronger, and really can use 6th gear at 60 MPH! And no codes thrown.
Best $100.00 I have spent on 08 Road King. Highly reccomend. (Posted on 5/3/2021)
Easy install Review by Knightster
Great product, fast shipping and easy to install. I haven't noticed a difference yet but I read it takes a tank or two for the computer to recognize it. (Posted on 3/31/2021)
Fantastic Review by John
2009 Street Bob. W/out a doubt, instant difference in temperature. Much cooler, even in stop and go. Slight increase in throttle response. You'd be a fool not to use these. I'm very impressed. (Posted on 9/8/2020)
Runs Cooler and More Responsive! Review by Mitch
Installed on my 2009 Super Glide Custom. The bike runs much cooler and the acceleration is much smoother. I lost the decel. pop that I was getting in 3rd gear. I have the Arlen Ness Big Sucker and the Vance & Hines Slip On's. The bikes exhaust even sounds better too.It took about 2 gas tanks for the computer to recognize the change. (Posted on 8/21/2020)
Just what I needed for my Road King Review by Mac
I have a 2007 Road King 96" with a K&N A/C kit, Screamin' Eagle 3.5" Street Cannon slip ons. I have a 1.75" louvered baffle in the left and 2" louvered baffle in the right. After reading a lot about this I was skeptical but I must say install was super easy. Bike runs 30Deg cooler. Throttle response is improved. Low end torque is strong and smooth. I can climb a hill in 6th gear. I can still make the bike pop on decel but I have to be trying to do it, won't happen otherwise. Be patient. I had no noticable change for about 300mi, but now it seems to have caught up. Love my bike even more now. (Posted on 6/26/2020)
Way cheaper than a tuner. Review by Clint
So I bought these for my 07 roadking and they were just the magical zing my bike needed. Bought the bike with aftermarket exhaust already installed but still have stock air filter. Once bike was at operating temperature it was almost to hot to ride, a common harley problem. When I installed these I also installed an Arlen Ness big sucker intake kit, between these two items my bike really came alive and doesn't run nearly as hot as before. Throttle response is crisp and smooth, no chugging at low speeds and can actually ride in 6th gear now without having to down shift all the time. After 200 miles so far my brand new plugs have a good tan and not snow white from running lean. Thank you for these, they really helped and changed my bike for the better, best of all they didn't cost me $800($400 for a tuner and $400 for dyno time to tune it). These fit the bill perfectly for an all stock bike. Super fast shipping to boot, what more could you ask for? (Posted on 1/22/2020)
XIED Review by Coconutnotwell
I put this on my 2008 96”road king all stock 5000k miles, I only rode for 8 miles and could feel the defense much better more response ,more fun to ride, thank you (Posted on 9/5/2019)
Cooler, smoother on lower octane Review by 08FLHTC
Very pleased with this upgrade! My 96ci Twin Cam is running cooler and I have switched to regular (87) octane without significant popping during deceleration. Little change in fuel economy and noticeably smoother running engine. If you have a 6 speed like me, increased responsiveness is really noticeable in sixth gear at lower RPM. What a simple improvement! (Posted on 7/24/2019)
No decel pop Review by Renzo
Have stage 1 on 07 nightster. Deceleration pop mostly gone. Acceleration has noticable improvement. Plug and play and saved me $300 over Fuel Pack. Highly recommend. (Posted on 7/22/2019)
Quick plug and play Review by BradX
Plugged directly in. Wires were short enough to hide excess. Only have 100 miles on them since I put them in. Almost no decel pop. (Posted on 5/7/2019)
XIEDs do what they’re supposed to do Review by Roy
The XIEDs were really easy to install and made a big difference to the way the bike runs. It’s noticeably cooler, smoother and the low speed surging is completely gone once the bike is warmed up. I wasn’t looking for a “race tune”, just something to make my bike run like it should’ve from the factory and the XIEDs do pretty much exactly that. (Posted on 4/15/2019)

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