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A small market ($21K/yr) — this niche doesn't clear our bar today.

Market size 5Growth 13Conversion 7Competition 60Returns 41Price range 54Avg price 90Brand share 24Review moat 73Quality gap 33

Avg price

Great$59.56

avg listing price — sweet spot $15–$100

Review moat

Good573.91

avg incumbent reviews — the moat a new listing must climb

Competition

Good49%

top-5 click share — leaders hold, buyers still browse

Price range

Good$4.83–$161.70

cheapest to priciest tracked listing — scored on the share inside $15–$100

Returns

Okay4.0%

return rate — above 6% kills the launch gate

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Brand share

Bad90%

top-5 brand share — brand-locked demand

Growth

Bad-24.7%

90-day search growth — must beat 0% to launch

Conversion

Bad0.6%

search→purchase rate — share of searches ending in a sale

Market size

Bad$21K

$21K/yr · 63K searches

Competition

The top 5 products take 49% of clicks — established leaders, but buyers still shop beyond them.

Brands

11 flat

Sellers

45

Top-5 brand share

90%

Open market

7%

  • Motorcraft44%
  • Ford24%
  • MAS15%
  • OVERSTOCKDIRECT4%
  • A-Premium3%
  • ENA3%
  • Open — no brand owns it (5 brands, 7%)

Product shelf

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%5%$1K10%$2K15%$3K20%$4K1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 35 tracked products in this niche — three views at once, no toggling.

Demand

Weekly Amazon search volume, last 19 weeks — -24.7% search growth over the last 90 days.
2K1KMar '26Mar '26Apr '26May '26May '26Jun '26

Reviews

What buyers praise and complain about, mined from review topics.

What buyers love

Value For Money20%

“Worth it”

Quality-Overall20%

“Excellent product vehicle is”

Size-Overall13%

“Correct fit”

Advertised Vs Actual Product9%

“Works as intended”

Socket/Port/Plug9%

“Good plugs”

Efficiency6%

“Works well”

Assembly/Installation6%

“Easy to install”

Durability3%

“Reliable”

Correct Contents3%

“Good Parts”

Maintenance And Repair2%

“Car repair”

What buyers complain about

Quality-Overall18%

“Poor handling of product”

Size-Overall11%

“Too tall to fit under fuel rail”

Durability9%

“Didnt last”

Product Condition7%

“used and broken”

Value For Money7%

“Injectors are expensive”

Socket/Port/Plug7%

“2 of the plugs were defective”

Compatibility-Overall7%

“Did not fit 2010 4.6 L V8”

Advertised Vs Actual Product5%

“They don't look anything like the picture”

Defective Material/Parts4%

“Car parts”

Fuel Efficiency3%

“would shudder when you got on the gas”

Top return reasons

Size-Overall39%
Compatibility-Overall20%
Defective Material/Parts10%
Product Condition6%
Functionality-Overall5%
Socket/Port/Plug5%
Advertised Vs Actual Product5%
Value For Money3%
Maintenance And Repair1%
Motor Issues1%