Derale 13021 -6AN x -6AN In-Line Fluid Thermostat
Price as of 2026-07-06. Check Amazon for the current price.
Quick Decision
Price Intelligence
- Budget:$4–$18
- Mid-range:$18–$64← You are here
- Premium:$64+
Is This Right For You?
- •Buyers who prioritize quality over price in filters
- •Derale loyalists — the brand spans 39 products in our database
- •Rating sits in the bottom 19% of filters — higher-rated options exist
- •K&N High-Flow Original Lifetime Universal Clamp-On Air offers a better rating (4.6/5) at a similar or lower price ($42)
- •Mishimoto 3" Straight Coupler — 55% cheaper at $21 (Score B+)
- •Spectre Performance 9771 Black 4" Intake Coupler — higher rated at 4.7/5 ($23)
📊 Based on data analysis of 97 products in this category.
Mubboo Score: B
How we calculate the Mubboo Score
Quality (45%): customer rating, normalized to a 10-point scale
Popularity (35%): review volume vs the category leader, log-scaled
Value (20%): price position vs other filters
Computed from live Amazon rating, review count, and price across 97 filters available to US consumers · last refreshed 2026-07-06.
How It Compares
This Product Derale 13021 -6AN x -6AN In-Line Fluid Thermostat | Most Popular K&N High-Flow Original Lifetime Universal Clamp-On Air | Best Rated Spectre Performance 9771 Black 4" Intake Coupler | Best Value Mishimoto 3" Straight Coupler | |
|---|---|---|---|---|
| Price | $47.87 | $41.99 | $22.99 | $21.44 |
| Rating | 4.4/5 | 4.6/5 | 4.7/5 | 4.7/5 |
| Reviews | 328 | 5,136 | 1,001 | 631 |
| Mubboo Score | B | A- | B+ | B+ |
What People Say
Synthesized from 40 reviews · 100% verified purchases.
Potential noise from intakes can be intrusive during towing or long drives; verify hardware completeness. For oil filters, use the wrench nut but avoid overtightening.
- Performance and sound enhancement
- Ease of installation
- Durable build quality
- Good value for money
- Excessive noise on sustained drives
- Confusing installation instructions or missing hardware
- Durability defects
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About Derale
- 39 products in our database
- Average rating: 4.5/5 across all products
- Price range: $17.72 – $439.88
- Categories: belts-hoses-and-pulleys, engine-cooling, engines-and-engine-parts, filters, fuel-system, switches-and-relays
If not the 13021 -6AN x -6AN In-Line Fluid Thermostat, consider these
Bottom Line
Derale 13021 -6AN x -6AN In-Line Fluid Thermostat earns Mubboo Score B. Priced at $48 — a premium option, below the category average of $54. Rated 4.4/5 from 328+ reviews. Strong buy if: buyers who prioritize quality over price in filters, derale loyalists. Skip if: rating sits in the bottom 19% of filters — K&N High-Flow Original Lifetime Universal Clamp-On Air (Score A-, $42) may fit better.
Frequently Asked Questions
Is the Derale 13021 -6AN x -6AN In-Line Fluid Thermostat worth buying in 2026?
It earns a Mubboo Score of B, with a 4.4/5 rating from 328 reviews — better than 19% of filters we track.
How much does the Derale 13021 -6AN x -6AN In-Line Fluid Thermostat cost?
It is currently $47.87 — premium-tier pricing for filters.
How does the 13021 -6AN x -6AN In-Line Fluid Thermostat compare to other filters?
The category's most-reviewed alternative is the K&N High-Flow Original Lifetime Universal Clamp-On Air (4.6/5, 5,136 reviews, $41.99). The 13021 -6AN x -6AN In-Line Fluid Thermostat carries a Mubboo Score of B vs A-.
Sources & References
Products available through US retailers. Prices in USD. Sales tax varies by state and is not included.
Mubboo may earn a commission on purchases made through affiliate links. This does not affect our Mubboo Score, product rankings, or editorial judgments. Prices are accurate as of the last sync (2026-07-06) and may change.