---
title: "Ninja 400 Exhaust — $9K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/ninja-400-exhaust"
last_updated: "2026-08-10T10:46:27.332Z"
locale: en
meta:
description: "Niche score 43/100 · $9K/yr market · 12K searches/yr · $55.73 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 43/100 · $9K/yr market · 12K searches/yr · $55.73 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Ninja 400 Exhaust — $9K/yr Amazon US Niche (2026) - Flapen"
---
# **ninja 400 exhaust**
**Skip it**
A small market ($9K/yr) — this niche doesn't clear our bar today.
Market size 2Growth 58Conversion 17Competition 30Returns 16Price range 80Avg price 91Brand share 46Review moat 94Quality gap 83
**Review moat**
**Great****114.65**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Great****$55.73**
avg listing price — sweet spot $15–$100
**Quality gap**
**Great****4.2★**
avg incumbent rating — lower means beatable quality
**Price range**
**Great****$24.82–$117.35**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Good****+32.6%**
90-day search growth — must beat 0% to launch
**Brand share**
**Okay****77%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****67%**
top-5 click share — leaders hold, buyers still browse
**Conversion**
**Bad****1.4%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Bad****7.6%**
return rate — above 5% kills the launch gate
**Market size**
**Bad****$9K**
$9K/yr · 12K searches
**Signals**[** High Returns**](https://flapen.com/research/niches?market=us&signal=high_returns "Return rate > 5%") [** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50") [** Out of Stock**](https://flapen.com/research/niches?market=us&signal=out_of_stock "OOS rate > 10%")
According to Flapen's Amazon United States niche tracking, ninja 400 exhaust is a $9K/yr Amazon United States market (12K searches/yr). The top 5 brands hold 77% of demand. Demand peaks in Apr–Jul–Aug–Sep. Verdict: Skip it — 43/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **ninja 400 exhaust market data**
- **Units sold / yr**
- **100–250**
- avg 0–100/product
- **Revenue / yr**
- **$6K–$14K**
- units × avg price
- **Conversion rate**
- **1.4%**
- **Avg BSR**
- **#447**
- **Page quality**
- **0%**
- **Prime**
- **71%**
- **Sponsored**
- **71%**
- **Out of stock**
- **6.6%**
- **Avg brand age**
- **44 months**
- **Avg seller age**
- **263 days**
## **Competition & brand share**
The top 5 products take 67% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▼falling
**Sellers**
**17**
**Top-5 brand share**
**77%**
Top 20: 100%
**Top-5 click share**
**67%**
Top 20: 100%
**Open market**
**18%**
- PACEWALKER22% - JFG RACING20% - Lesiyou16% - WATERWICH10% - Generic9% - YZCHAIN5%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +32.6% search growth over the last 90 days.
800600Spike '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, Jul, Aug, Sep · busiest ÷ quietest = 2.6×
[**Open Trend **](https://flapen.com/research/us/automotive/ninja-400-exhaust/trend)
## **Top ninja 400 exhaust search terms**
- **ninja 400 exhaust**8K/yr+49.0%0.9% conv. - **ninja 400 slip on exhaust**2K/yr+12.6%1.2% conv. - **kawasaki ninja 400 exhaust**2K/yr-6.7%0.3% conv. [**All search terms **](https://flapen.com/research/us/automotive/ninja-400-exhaust/search-terms)
## **Top ninja 400 exhaust products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$47210%$94515%$1K20%$2K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)6 products missing review or click data not plotted
All 17 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**JFG RACING Motorcycle Slip On Exhaust with Muffler for Ninja 400 2016-2023**JFG RACING**$51.44**4.0★57 rev](https://www.amazon.com/dp/B0BD8NDNFH) [2**Lesiyou Motorcycle Muffler Mid Pipe Muffler Adapter Connect Pipe Compatible with Kawasaki Ninja 400 Z400 2018 2019 2020 2021 2022 2023 Ninja 500 2024**Lesiyou**$59.19**4.1★111 rev](https://www.amazon.com/dp/B0DKXDSR81) [3**Exhaust Muffler Carbon Fiber 1.5-2Inlet with Removable DB Killer for Street/Sport Motorcycles and Scooters with 38-51mm Diameter Exhaust Pipes**PACEWALKER**$38.16**4.2★1,384 rev](https://www.amazon.com/dp/B074CVHHGC) [4**WATERWICH Motorcycle Muffler Compatible with Kawasaki Ninja 400 Z400 2018 2019 2020 2021 2022 2023**WATERWICH**$58.66**4.2★117 rev](https://www.amazon.com/dp/B098DQ96YT) [5**Slip on Exhaust for Kawasaki Ninja 400 Z400 2018-2023 Motorcycle Muffler with Removable Baffle Stainless Steel/Aluminum Easy Installation (No Welding)**YZCHAIN**$48.02**0.0★0 rev](https://www.amazon.com/dp/B0GBL67G5X)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Black Slip-On Exhaust Muffler compatible with GY6 Ninja400 Z400 R3 MT-03**Generic**$53.98**0 rev1mo ago](https://www.amazon.com/dp/B0H3G1RMX2) [**autozen Exhaust Muffler Compatible with Kawasaki Ninja 400 Z400 2018 2019 2020 2021 2022 2023 30cm Matte Black with Adapter Connect Pipe Slip-On Motorcycle Exhaust**autozen**$48.77**0 rev2mo ago](https://www.amazon.com/dp/B0GXZPP11K) [**Muffler Exhaust Mid Pipe For NINJA400 Z400 EX400**Generic**$96.51**0 rev5mo ago](https://www.amazon.com/dp/B0GJG6GWW2) [**Slip on Exhaust for Kawasaki Ninja 400 Z400 2018-2023 Motorcycle Muffler with Removable Baffle Stainless Steel/Aluminum Easy Installation (No Welding)**YZCHAIN**$48.02**0 rev6mo ago](https://www.amazon.com/dp/B0GBL67G5X) [**YIPONYT Universal Motorcycle Exhaust 1.42-2 Carbon Fiber Slip on Exhaust Muffler Diameter 51mm Exhaust for Motor Dirt Bike Scooters with Complete Accessories Black**YIPONYT**$39.88**0 rev8mo ago](https://www.amazon.com/dp/B0G1T1K97Y)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Black Slip-On Exhaust Muffler compatible with GY6 Ninja400 Z400 R3 MT-03**Generic**$53.98**0.0★**▲ 236%**](https://www.amazon.com/dp/B0H3G1RMX2) [**autozen Exhaust Muffler Compatible with Kawasaki Ninja 400 Z400 2018 2019 2020 2021 2022 2023 30cm Matte Black with Adapter Connect Pipe Slip-On Motorcycle Exhaust**autozen**$48.77**0.0★**▲ 235%**](https://www.amazon.com/dp/B0GXZPP11K) [**YIPONYT Universal Motorcycle Exhaust 1.42-2 Carbon Fiber Slip on Exhaust Muffler Diameter 51mm Exhaust for Motor Dirt Bike Scooters with Complete Accessories Black**YIPONYT**$39.88**0.0★**▲ 235%**](https://www.amazon.com/dp/B0G1T1K97Y) [**Motorcycle Exhaust Muffler Black Used For Ninja 400 R3CB650R**LILIUPEILONG**$117.35**0.0★**▲ 235%**](https://www.amazon.com/dp/B0FVLRZ9B8) [**Slip on Exhaust for Kawasaki Ninja 400 Z400 2018-2023 Motorcycle Muffler with Removable Baffle Stainless Steel/Aluminum Easy Installation (No Welding)**YZCHAIN**$48.02**0.0★**▲ 234%**](https://www.amazon.com/dp/B0GBL67G5X)
**~~View all trending →~~**
## **What buyers say about ninja 400 exhaust**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Audio Quality**15%
*“Sounds great”*
**Size-Overall**12%
*“Fits great”*
**Value For Money**12%
*“Well worth the money so far”*
**Quality-Overall**11%
*“Much better performance”*
**Assembly/Installation**9%
*“Easy to install”*
**Noise Level**8%
*“The exhaust sounds good”*
**Efficiency**4%
*“Worked for me”*
**Design-Overall**3%
*“Looks and sounds great”*
**Durability**2%
*“Durable”*
**Advertised Vs Actual Product**2%
*“Looks and works as advertised”*
### **What buyers complain about **
**Noise Level**14%
*“Super loud”*
**Quality-Overall**9%
*“Cheap junk”*
**Paint Quality**8%
*“Paint and plastic peels after 20 miles”*
**Size-Overall**5%
*“it didn't fit on my motorcycle so I had to return the item”*
**Durability**4%
*“Ive just recently broken it in”*
**Material Quality**4%
*“obviously not carbon fiber”*
**Compatibility-Overall**4%
*“This will not fit the xpro 150cc dirt bike unless you buy a 38 to 32mm adaptor”*
**Mounting**3%
*“Difficult to mount”*
**Connectivity-Overall**2%
*“Nothing to connect to muffler”*
**Value For Money**2%
*“Expected from a cheap exhaust”*
### **Top return reasons **
**Size-Overall**60%
**Compatibility-Overall**14%
**Defective Material/Parts**4%
**Advertised Vs Actual Product**3%
**Assembly/Installation**2%
**Value For Money**2%
**Shape/Style**2%
**Mounting**2%
**Functionality-Overall**2%
**Quality-Overall**2%
## **Common questions**
- **Is ninja 400 exhaust profitable to sell on Amazon United States?**
- The niche generates $9K/yr across 17 tracked products. 0 of 6 products launched in the last 360 days are still selling. 90-day search growth is +32.6%. Flapen's verdict: Skip it (43/100).
- **How competitive is the ninja 400 exhaust niche?**
- 13 brands and 17 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 77% of demand.
- **What do buyers complain about in ninja 400 exhaust?**
- Top complaints mined from reviews: Noise Level, Quality-Overall, Paint Quality. The return rate is 7.6% — above our launch gate.
- **When does demand for ninja 400 exhaust peak?**
- Demand peaks in Apr–Jul–Aug–Sep; the busiest month runs 2.6× the quietest.
- **What does it cost to enter the ninja 400 exhaust niche?**
- Listings span $24.82–$117.35; the average listing price is $55.73 (sweet spot $15–$100). The average incumbent carries 115 reviews — the moat a new listing must climb.
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