As of October 2026, CarSearch.Pro's True Value model estimates a typical Porsche 718 Boxster/Cayman GT4 RS is actually worth $139,400 (fair range $122,700 to $156,100). Unlike the median asking price shown above, True Value is anchored to 108 recent confirmed sales, normalized for mileage, and blends auction hammer prices (grossed up for buyer's premium) with real-world asking behavior.
Sellers are currently asking a median of $169,400 — about 22% above what these cars have actually been selling for. That gap favors patient buyers: negotiate from the sold data, not the ask.
Well-supported value · momentum improving — but volatile.
As of October 2026, the Porsche 718 Boxster/Cayman GT4 RS market has 278 active listings across 14 marketplaces tracked by CarSearch.Pro. The median asking price is $159,970, with the middle 50% of listings priced between $132,990 and $208,766. RS prices have increased 7.4% over the past quarter, from a median sale price of $189,900 to $203,995.
The typical RS on the market has 8,000 miles. Listings spend an average of 54 days on market before selling or being removed.
Current RS Pricing
A fair price for a Porsche 718 Boxster/Cayman GT4 RS in October 2026 is between $132,990 and $208,766 (25th to 75th percentile). Prices range from $119,050 to $219,992 across 278 active listings.
Price Distribution (278 Active Listings)
Percentile
Price
Meaning
10th
$119,050
Budget / project cars
25th
$132,990
Below average price
Median (50th)
$159,970
Typical market price
75th
$208,766
Above average / premium
90th
$219,992
Top tier / low miles / rare spec
The average asking price is $168,889, which is higher than the median, indicating that high-priced outliers (rare specifications, very low mileage, or concours-quality examples) pull the average up.
Price by Mileage
Mileage Range
Listings
Median Price
Under 10,000 mi
166
$203,083
10,000 - 25,000 mi
79
$134,995
25,000 - 50,000 mi
25
$124,991
50,000 - 100,000 mi
2
$107,995
RS Price Trends
Porsche 718 Boxster/Cayman GT4 RS prices have increased 7.4% over the past quarter. In 2026-Q4, the median sale price was $203,995 across 31 sales, up from $189,900 in 2026-Q3.
On a year-over-year basis, RS prices are up 9.1% ($203,995 vs. $187,000 a year ago).
RS Quarterly Sale Prices (Historical)
Quarter
Sales
Median Price
Average Price
2025-Q1
29
$180,000
$167,525
2025-Q2
67
$185,424
$174,261
2025-Q3
69
$189,800
$177,067
2025-Q4
80
$187,000
$173,856
2026-Q1
113
$172,000
$167,104
2026-Q2
207
$201,000
$191,214
2026-Q3
135
$189,900
$181,900
2026-Q4
31
$203,995
$195,846
Best Value RS by Model Year
The 2016 RS offers the best value with a median price of $124,991 across 64 listings. The most expensive model year is 2025 at a median of $217,789.
Median Price by Model Year
Year
Listings
Median Price
Min
Max
2016
64
$124,991
$22,000
$159,995
2020
33
$136,773
$122,000
$175,312
2021
25
$144,499
$50,000
$169,981
2022
13
$140,995
$114,995
$189,000
2023
64
$199,612
$122,000
$249,000
2024
36
$206,993
$173,000
$279,000
2025
40
$217,789
$105,858
$290,070
How Mileage Affects RS Value
Most price guides assume value falls linearly with mileage. It doesn't. CarSearch.Pro learns the actual price-vs-mileage curve for the Porsche 718 Boxster/Cayman GT4 RS from confirmed sales, referenced to a typical example at about 4,250 miles:
Odometer (approx.)
Value Multiplier
Implied Value
558 mi
1.17x
$163,568
4,693 mi
1.02x
$142,562
10,437 mi
0.77x
$107,126
18,511 mi
0.77x
$107,284
38,148 mi
0.89x
$123,405
57,000 mi
0.81x
$112,794
97,980 mi
0.74x
$102,934
154,919 mi
0.66x
$92,520
300,000 mi
0.58x
$80,989
Low-mileage examples carry a real premium in this market: around 558 miles, cars trade at roughly 1.17x the reference value. At the other end, 300,000-mile examples trade at about 0.58x. Implied values here are anchored to this market's True Value.
RS Price Forecast
Horizon
Direction
Probability
Regime
Past Accuracy
6 months
↑ UP
55%
volatile
68% over 44 tests
12 months
↑ UP
60%
volatile
66% over 38 tests
24 months
↑ UP
65%
volatile
92% over 26 tests
These are probabilistic direction calls, not price targets. The "Past Accuracy" column is this model's real walk-forward record on the Porsche 718 Boxster/Cayman GT4 RS — every month we re-run the forecast as if we only knew what was knowable then, and grade it against what actually happened. We publish the hit rate either way. Full methodology & track record →
Where to Buy a RS
The highest concentration of Porsche 718 Boxster/Cayman GT4 RS listings is in CA with 17 active listings, followed by AZ (16), NC (11), FL (11), NY (11).
Regional pricing varies significantly. The lowest median price is in NY at $124,999, while MA has the highest at $215,695. Buyers willing to travel or arrange transport may find savings of $90,696.
Top States by Inventory
State
Listings
Median Price
CA
17
$205,083
AZ
16
$159,991
NC
11
$133,997
FL
11
$185,000
NY
11
$124,999
PA
10
$205,000
IL
9
$204,900
OH
8
$134,995
TX
7
$132,990
VA
6
$145,585
RS Market Velocity
Porsche 718 Boxster/Cayman GT4 RS listings spend an average of 54 days on market. This is a slower market. Buyers have negotiating leverage, especially on listings that have been active for 60+ days. Sellers should consider competitive pricing from the start.
The median time on market is 28 days. The lower median suggests most cars sell relatively quickly, while a smaller number of overpriced listings drag up the average.
RS Buyer's Guide Summary
Fair price range: $132,990 to $208,766. The median is $159,970. Anything below $132,990 is a strong value; above $208,766 should be premium condition, low miles, or a desirable specification.
Trending up: RS prices have risen 7.4% recently. Buying sooner may save money if the trend continues.
Best value year: The 2016 model year has the lowest median price at $124,991, making it the most accessible entry point into RS ownership.
Take your time, but don't delay: Average days on market is 54. You have some time to research, but the best deals still go fast.
Data sourced from 8 marketplaces including eBay Motors, Bring a Trailer, Cars & Bids,
AutoTrader, CarGurus, Cars.com, Facebook Marketplace, Classic.com, and Hagerty Marketplace.
Updated daily by CarSearch.Pro's automated pipeline.
Browse all 278 active RS listings.
Read the latest RS market analysis.