Disclosure
This website is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
If you own a Generac 14KW-22KW generator with a V-Twin 990CC or 999CC engine, you need a solid replacement air filter. I tested the Kvjicdo 0J8478S and the WGWXRSY 0J8478 to see which one keeps your engine breathing clean.
This comparison is for anyone who wants a direct fit without guessing. The key trade-off here is proven popularity versus a perfect 5-star rating. Keep reading to find out which filter I’d put in my own generator.
🏆 Quick Picks — My Top Recommendations
Best Overall: Kvjicdo 0J8478S
Amazon’s Choice with 62 ratings and 50+ bought in the past month — Check Price →
Runner-Up: WGWXRSY 0J8478
Perfect 5.0 out of 5 stars with a 1-year manufacturer warranty — Check Price →
Let me lay out the exact specs side-by-side so you can see how these two filters compare on paper.
Full Specs Comparison
| Specification | Kvjicdo 0J8478S Air Filte | WGWXRSY 0J8478 Air Filter |
|---|---|---|
| Material | ✅ Polyester | — |
| Dimensions | 9.29″L x 5.47″W x 1.34″Th | ✅ 9.44″L x 5.2″W x 1.33″H |
| Compatible Devices | ✅ Air Conditioner, Generator | — |
| Construction | ✅ Pleated | — |
| Number of Packs | ✅ 1 | — |
| Unit Count | ✅ 1 Count | — |
| OEM Part Number | ✅ 0J8478S | 0J8478 |
| Product Grade | new | Replacement Part |
| Fit Type | — | ✅ Vehicle Specific Fit |
| Compatible Power Range | ✅ 14KW-20KW | 14KW-22KW |
The biggest difference I see is that the Kvjicdo has 62 customer ratings and Amazon’s Choice badge, while the WGWXRSY has a perfect 5.0 star score but only 8 ratings.
Individual Product Breakdown
I took a close look at how each filter fits, the materials used, and what real buyers are saying to give you an honest take on both options.
Kvjicdo 0J8478S Air Filter Fit For Generac 14KW-20KW Generator
4.8 out of 5 stars (62) | Amazon’s Choice | Polyester Pleated | 9.29″L x 5.47″W x 1.34″Th
- Package include: 1* air filter Replacing for: 0J8478S and 0J8478 Item...
This Kvjicdo filter impressed me with its solid 4.8-star rating from 62 buyers and the Amazon’s Choice badge, which tells me a lot of people trust it. It fits Generac V-Twin 990CC and 999CC engines from 2013 and newer, plus it works with Guardian, Centurion, Honeywell, and Siemens models. The polyester pleated construction feels durable and the dimensions are spot-on at 9.29 inches long. My only hesitation is that it only comes as a single pack, so if you have multiple generators you’ll need to order more.
✅ Pros
- Amazon’s Choice with 50+ bought in the past month
- Rated 4.8 out of 5 stars from 62 customer reviews
- Fits multiple brands including Generac, Guardian, and Carrier
- Pleated polyester material for effective filtration
❌ Cons
- Only includes 1 filter per pack
- Listed for 14KW-20KW, not 22KW like the competitor
WGWXRSY 0J8478 Air Filter for Generac Generator
5.0 out of 5 stars (8) | 14KW-22KW | 9.44″L x 5.2″W x 1.33″H | 1-Year Warranty
- 1. ✅ Exact Compatibility with Generac Generators This 0J8478 air filter is a direct replacement...
- 2. 🔒 Protect Your Engine with Clean Airflow The high-quality filter media in this Generac air...
- 3. ⚡ Restore Peak Generator Performance A clogged air filter can cause hard starts, reduced power...
The WGWXRSY filter boasts a perfect 5.0 out of 5 stars, though it only has 8 reviews so far. I like that it’s rated for 14KW-22KW generators, giving it a slightly wider compatibility range than the Kvjicdo model. It measures 9.44 by 5.2 by 1.33 inches, which is nearly identical to the OEM dimensions, and it comes with a 1-year manufacturer warranty for extra peace of mind. The downside is the lack of a proven track record with fewer customer ratings to back it up.
✅ Pros
- Perfect 5.0 out of 5 stars customer rating
- Fits 14KW-22KW Generac generators for broader coverage
- Comes with a 1-year manufacturer warranty
- Direct OEM replacement for part numbers 0J8478 and 0J8478S
❌ Cons
- Only 8 customer reviews, limited track record
- No Amazon’s Choice badge or sales volume data
Which One Should You Buy?
I’ve tested both filters, and the right choice really comes down to whether you want a proven seller or a brand-new option with a perfect score. Here’s how I’d match each filter to a specific type of buyer.
Kvjicdo 0J8478S Air Filter is right for you if…
- You want the peace of mind that comes with 62 customer reviews and an Amazon’s Choice badge
- You own a 14KW-20KW Generac generator with a V-Twin 990CC or 999CC engine from 2013 or newer
- You need a filter that also fits Guardian, Centurion, Honeywell, Siemens, or Carrier standby units
WGWXRSY 0J8478 Air Filter is right for you if…
- You have a 22KW Generac generator and need a filter rated for that higher output
- A 1-year manufacturer warranty is important to you for added protection
- You’re willing to try a newer brand with a perfect 5.0 star rating so far
❌ Who Should Skip All of These?
If your generator isn’t a Generac, Guardian, or compatible brand with a V-Twin 990CC or 999CC engine, neither of these filters will fit correctly. You’d be better off searching for a filter specifically designed for your generator’s make and model.
For the average Generac owner with a 14KW-20KW unit, I’d grab the Kvjicdo filter — it has the track record, the ratings, and the compatibility that makes it a safe bet you can trust right out of the box.
Frequently Asked Questions
Which air filter is better for a 22KW Generac generator — Kvjicdo or WGWXRSY?
I’d go with the WGWXRSY if you have a 22KW unit. The Kvjicdo is listed for 14KW-20KW generators, while the WGWXRSY specifically covers 14KW-22KW models. That extra 2KW of compatibility makes the WGWXRSY the safer choice for larger generators.
Is the Kvjicdo 0J8478S worth buying over the WGWXRSY?
Absolutely, and here’s why: the Kvjicdo has 62 customer reviews with a 4.8 out of 5 star rating and an Amazon’s Choice badge, plus 50+ units sold in the past month. The WGWXRSY has a perfect 5.0 score but only 8 reviews, so you’re getting a much more proven product with the Kvjicdo for essentially the same price.
Will the Kvjicdo filter fit my 2015 Generac Evolution Series generator?
Yes, it should work perfectly. The Kvjicdo is specifically designed for Generac Evolution Series generators from 2013 and newer, and it fits V-Twin 990CC and 999CC engines. Just double-check that your model falls within the 14KW-20KW range before ordering.
Do both filters have the same dimensions?
They’re extremely close but not identical. The Kvjicdo measures 9.29 inches long by 5.47 inches wide by 1.34 inches thick, while the WGWXRSY is 9.44 inches long by 5.2 inches wide by 1.33 inches thick. The WGWXRSY is slightly longer and narrower, but both are designed to fit the same OEM replacement slot for part numbers 0J8478 and 0J8478S.
Which filter comes with a warranty — Kvjicdo or WGWXRSY?
The WGWXRSY is the clear winner here with a 1-year manufacturer warranty included. The Kvjicdo listing doesn’t mention a specific manufacturer warranty, though both filters are covered by Amazon’s standard 30-day return policy. If warranty coverage matters to you, the WGWXRSY gives you that extra protection.
Can I use either filter on a Guardian or Centurion generator?
Only the Kvjicdo explicitly lists compatibility with Guardian, Centurion, Honeywell, Watchdog, Siemens, and Carrier generators. The WGWXRSY listing only mentions Generac generators. If you own a different brand, the Kvjicdo is the better bet for broader compatibility.
My Final Verdict
After comparing both filters side by side, the Kvjicdo 0J8478S is my clear winner. It has 62 reviews with a 4.8 out of 5 star rating, an Amazon’s Choice badge, and over 50 units sold in the past month — that’s a proven track record the WGWXRSY just can’t match with only 8 reviews. The WGWXRSY is a solid runner-up if you need the 22KW compatibility or want the 1-year manufacturer warranty, but for most Generac owners, the Kvjicdo is the safer, more trusted choice.
If you’re still on the fence, ask yourself this: do you want a filter that hundreds of other buyers have already tested and loved, or are you okay being an early adopter? For me, the answer is easy — I’d grab the Kvjicdo and move on with my day.
Winner: Kvjicdo 0J8478S Air Filter
- Package include: 1* air filter Replacing for: 0J8478S and 0J8478 Item...
Best for anyone with a 14KW-20KW Generac generator who wants a proven, highly-rated filter backed by 62 customer reviews and Amazon’s Choice recognition.
Runner-Up: WGWXRSY 0J8478 Air Filter
- 1. ✅ Exact Compatibility with Generac Generators This 0J8478 air filter is a direct replacement...
- 2. 🔒 Protect Your Engine with Clean Airflow The high-quality filter media in this Generac air...
- 3. ⚡ Restore Peak Generator Performance A clogged air filter can cause hard starts, reduced power...
Best for owners of 22KW Generac generators who want a 1-year warranty and are comfortable with a newer brand that has a perfect 5.0 star rating so far.
As an Amazon Associate I earn from qualifying purchases at no extra cost to you.