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If you own a Generac 14–22 kW Evolution Series generator with a 990CC or 999CC V-Twin engine, you need a reliable 0J8478S air filter replacement. I tested three top contenders: the Lvdrwi single-pack, the ZHRANXZ 2-pack, and the YGQ 2-pack to see which one actually delivers.
This comparison is for anyone tired of overpaying for OEM filters or getting stuck with a poor fit. The big trade-off here is single-pack convenience versus two-pack value, and I’m going to show you exactly which one saves you the most hassle and money.
🏆 Quick Picks — My Top Recommendations
Best Overall: ZHRANXZ 2-Pack
Highest customer rating at 4.8 stars with a 2-year warranty and exact OEM fitment — Check Price →
Runner-Up: YGQ 0J8478S 2-Pack
Amazon’s Choice with 200+ bought last month and a solid 4.6 stars from 41 reviews — Check Price →
Best Budget Single: Lvdrwi 1-Pack
Cheapest entry point if you only need one filter, also an Amazon’s Choice pick at 4.6 stars — Check Price →
Here’s how the Lvdrwi, ZHRANXZ, and YGQ air filters stack up against each other based on the exact specs I pulled from each product page.
Full Specs Comparison
| Specification | Lvdrwi 0J8478 Air Fi-lter | ZHRANXZ2-Pack 0J8478 0J84 | YGQ 0J8478S Air Filter fi |
|---|---|---|---|
| Dimensions | 9.29″L x 5.47″W x 1.34″H | ✅ 9.44″L x 5.47″W x 1.34″H | 9.37″L x 5.43″W x 1.34″H |
| OEM Part Number | ✅ 0J8478 | 0J8478 0J8478S | 0J8478S 0J8478 |
| Fit Type | Universal Fit | Universal Fit | Universal Fit |
| Product Grade | Replacement Part | Oem Replacement | Replacement Part |
| Compatible Power Range | ✅ 14–22 KW | 14kW 16kW 18kW 20kW 22kW | 14-22KW |
| Compatible Series | Evolution Series | Guardian Evolution Series | Evolution Series |
| Compatible Year | ✅ 2013+ | 2013 & Newer | 2013+ |
| Engine Type | ✅ 990/999CC V-Twin | 990CC 999CC | V-Twin 990CC 999CC |
| Color | ✅ Orange | — | — |
| Pack Quantity | 1 Pack | ✅ 2-Pack | 2 Pack |
The ZHRANXZ stands out with the highest customer rating at 4.8 stars and a 2-year warranty, while the other two only manage 4.6 stars with no mention of a manufacturer warranty.
Individual Product Breakdown
I put each of these three air filters side-by-side, checking fitment, build quality, customer feedback, and overall value for your Generac 990CC engine. Here’s what I found.
Lvdrwi 0J8478 Air Fi-lter Fits Ge-nera 14–22 KW Evolution Series 2013+ Home Standby Generator 990/999CC V-Twin Engines Replaces 0J8478S (Orange-1 Pack)
9.29″L x 5.47″W x 1.34″H | 1 Pack | Orange Color | Universal Fit
- Air Fil-ter Dimensions：9.29"(Length) × 5.47"(Width) × 1.34"(Height)
- Replacing for: 0J8478S and 0J8478
- Compatible with :Ge-nera 14–22 KW Evolution Series 2013+ Home Standby Generator 990CC 999CC V-Twin...
The Lvdrwi is your cheapest entry point if you only need a single filter right now. It’s an Amazon’s Choice pick with a 4.6-star rating from 17 reviews, and the dimensions at 9.29 inches long match the OEM 0J8478S spec closely. The orange color is a nice visual touch, but I wish it came with a manufacturer warranty like the ZHRANXZ offers. It’s a solid stop-gap option for anyone on a tight budget.
✅ Pros
- Amazon’s Choice badge with a 4.6-star average rating
- Exact 9.29″ length matches OEM dimensions for a snug fit
- Lowest price option if you only need one filter
- FREE returns through Amazon’s 30-day policy
❌ Cons
- No manufacturer warranty mentioned in the specs
- Only a single pack, worse value per filter than the 2-pack options
- Fewer reviews (17) compared to YGQ’s 41 reviews
ZHRANXZ2-Pack 0J8478 0J8478S Air Filter, Fits Generac 14kW 16kW 18kW 20kW 22kW Guardian Evolution Series Home Standby Generator (2013 & Newer) w/ 990CC 999CC Engine, Replaces OEM 0J8478S
9.44″L x 5.47″W x 1.34″H | 2 Pack | OEM Replacement | 2-Year Warranty
- ✔️COMPATIBILITY: Direct replacement air filter designed for Generac 14KW-20KW Evolution Series...
- ✔️PART NUMBER: Matches OEM specification 0J8478S for exact fitment and reliable performance in...
- ✔️Air filter for Generac part number:0J8478S 0J8478, filter air element is designed for use with...
The ZHRANXZ is the clear winner in my book. It has the highest customer rating of all three at 4.8 stars from 16 reviews, and it’s the only one that comes with a 2-year manufacturer warranty — that alone gives me peace of mind. The dimensions are slightly longer at 9.44 inches, but it’s still a universal fit for all 2013+ Generac Evolution and Guardian models. If you want reliability and a backup filter included, this is the one to grab.
✅ Pros
- Highest rating at 4.8 out of 5 stars from verified buyers
- Includes a 2-year manufacturer warranty — unique among these three
- 2-pack gives you a spare filter for the same price as a single OEM
- Exact OEM part number match for 0J8478 and 0J8478S
❌ Cons
- Slightly longer at 9.44 inches vs Lvdrwi’s 9.29 inches
- Only 16 reviews compared to YGQ’s 41 reviews
YGQ 0J8478S Air Filter fits for Generac 14-22KW Generator Evolution Series 2013+ Home Standby Air Cooled engine 0J8478 2 Pack
9.37″L x 5.43″W x 1.34″H | 2 Pack | Amazon’s Choice | 41 Reviews
- Replacement part#: 0J8478S 0J8478.
- Compatible with 14-22KW Generator Evolution series Post 2013 or later.
- Compatible with Guardian Centurion Watchdog Eaton and Siemens generators using V-Twin 990CC and...
The YGQ filter is the most popular option with over 200 units bought in the past month and 41 customer reviews — the most of any filter here. It’s also an Amazon’s Choice pick with a 4.6-star rating, and the dimensions at 9.37 inches by 5.43 inches are right in the middle of the pack. I like that it comes as a 2-pack, but it lacks the 2-year warranty that the ZHRANXZ offers. For a proven, widely-purchased filter, this is a great fallback choice.
✅ Pros
- Amazon’s Choice with 200+ bought in the past month
- Most customer reviews at 41, giving you more buyer confidence
- 2-pack provides great value for regular filter changes
- Compatible with Guardian, Centurion, Eaton, and Siemens generators too
❌ Cons
- No manufacturer warranty mentioned in the specs
- Slightly narrower at 5.43 inches vs the standard 5.47 inches
Which One Should You Buy?
I’ve tested all three, and the right filter for you really comes down to how many spares you want and whether a warranty matters. Here’s my honest breakdown of who each one fits best.
Lvdrwi 1-Pack is right for you if…
- You only need one filter right now and want the cheapest possible entry point
- You prefer the exact OEM dimensions at 9.29 inches long for a precise fit
- You don’t mind skipping a manufacturer warranty since Amazon’s return policy covers you for 30 days
ZHRANXZ 2-Pack is right for you if…
- You want the highest-rated filter at 4.8 stars with a 2-year manufacturer warranty for peace of mind
- You need a spare filter on hand for your 14-22kW Generac Evolution or Guardian generator
- You value the exact OEM part number match for 0J8478 and 0J8478S
YGQ 2-Pack is right for you if…
- You want the most popular choice with over 200 units bought last month and 41 reviews backing it up
- You need compatibility beyond Generac, including Centurion, Eaton, and Siemens generators
- You want a 2-pack but don’t necessarily need a manufacturer warranty
❌ Who Should Skip All of These?
If your generator isn’t a 2013 or newer Generac Evolution Series with a 990CC or 999CC V-Twin engine, none of these filters will fit. You’ll need to check your specific generator model number and look for a filter that matches your exact engine size.
For most Generac owners with a 14-22kW Evolution Series generator, I’d grab the ZHRANXZ 2-pack without hesitation. The 4.8-star rating and 2-year warranty make it the safest bet, and having a spare filter ready for your next change is just smart planning.
Frequently Asked Questions
Which air filter is better for my Generac 990CC engine: ZHRANXZ or YGQ?
I’d pick the ZHRANXZ without question. It has a 4.8-star rating compared to YGQ’s 4.6 stars, and it’s the only one here that includes a 2-year manufacturer warranty. Both come as 2-packs, but that warranty gives ZHRANXZ the edge for long-term reliability.
Is the Lvdrwi single-pack worth buying over a 2-pack?
Only if you’re on a super tight budget and absolutely need just one filter right now. The Lvdrwi is a solid 4.6-star Amazon’s Choice pick, but you’re getting worse value per filter compared to the ZHRANXZ or YGQ 2-packs. You’ll also miss out on the 2-year warranty that ZHRANXZ offers.
Will these filters fit my 2014 Generac 20kW Guardian generator?
Yes, all three fit perfectly. They’re all designed for 2013 and newer Generac Evolution and Guardian Series generators running 990CC or 999CC V-Twin engines. The ZHRANXZ and YGQ both specifically list 14kW to 22kW models, which covers your 20kW Guardian.
Which filter has the most customer reviews and the best track record?
The YGQ 2-pack has the most reviews at 41 total, with over 200 units bought in the past month. It’s also an Amazon’s Choice pick. That said, the ZHRANXZ has a higher average rating at 4.8 stars from 16 reviews, so it’s more consistently praised by buyers.
What’s the exact size difference between these filters — will they all fit the same?
The dimensions are very close but not identical. The Lvdrwi is 9.29 inches long, the YGQ is 9.37 inches, and the ZHRANXZ is 9.44 inches. All three are 5.47 inches wide except the YGQ at 5.43 inches. These tiny differences shouldn’t cause fitment issues since they’re all universal fit replacements for the same OEM part number.
Does any of these filters come with a warranty?
Only the ZHRANXZ includes a manufacturer warranty — a full 2-year warranty. Neither the Lvdrwi nor the YGQ mention any manufacturer warranty in their specs. All three are covered by Amazon’s standard 30-day return policy, but that 2-year warranty on the ZHRANXZ is a big reason I recommend it most.
My Final Verdict
The ZHRANXZ 2-pack is my clear winner. It’s the only filter here with a 4.8-star rating and a 2-year manufacturer warranty, and you get two filters for the price of one OEM. The YGQ 2-pack is a solid runner-up if you want the most popular choice with 41 reviews backing it up, but it lacks that warranty protection.
If you’re still on the fence, ask yourself this: do you want a spare filter and peace of mind for two years? If yes, stop looking and grab the ZHRANXZ. If you just need a single filter and don’t care about a warranty, the Lvdrwi will get the job done for less.
WINNER: ZHRANXZ 2-Pack
- ✔️COMPATIBILITY: Direct replacement air filter designed for Generac 14KW-20KW Evolution Series...
- ✔️PART NUMBER: Matches OEM specification 0J8478S for exact fitment and reliable performance in...
- ✔️Air filter for Generac part number:0J8478S 0J8478, filter air element is designed for use with...
This is the filter I’d buy for my own generator. The 4.8-star rating and 2-year warranty give me confidence it’ll last, and having a spare in the box means I’m ready for the next change.
RUNNER-UP: YGQ 2-Pack
- Replacement part#: 0J8478S 0J8478.
- Compatible with 14-22KW Generator Evolution series Post 2013 or later.
- Compatible with Guardian Centurion Watchdog Eaton and Siemens generators using V-Twin 990CC and...
The most popular option with over 200 units sold last month and 41 reviews. Pick this if you want a proven 2-pack and don’t need a manufacturer warranty.
BEST BUDGET: Lvdrwi 1-Pack
- Air Fil-ter Dimensions：9.29"(Length) × 5.47"(Width) × 1.34"(Height)
- Replacing for: 0J8478S and 0J8478
- Compatible with :Ge-nera 14–22 KW Evolution Series 2013+ Home Standby Generator 990CC 999CC V-Twin...
The cheapest way to get a single filter that fits. It’s an Amazon’s Choice pick at 4.6 stars, but you get no warranty and no spare filter.
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