Koni Special Active Shock 17+ Tesla Model 3/20+ Model Y AWD/RWD - Front Right - 8245 1421R

The KONI Special Active Shock (Part # 8245 1421R) is a front right replacement shock absorber engineered specifically for the 2017+ Tesla Model 3 and 2020+ Tesla Model Y (AWD and RWD). Designed by one of the most respected names in suspension engineering, this shock absorber uses KONI's latest-generation Frequency Selective Damping (FSD) technology to automatically adapt to road conditions — delivering a ride that is both composed and comfortable without any manual adjustment required. If your Tesla's factory shocks are worn, harsh, or simply no longer performing the way they should, the KONI Special Active is a direct-fit upgrade that installs cleanly and transforms the way your car feels on the road.

Key Features & Benefits

• Frequency Selective Damping (FSD) Technology: KONI's Special Active shocks automatically adjust their damping force in response to the frequency and intensity of road inputs. This means the shock softens over low-frequency bumps and rough pavement (improving comfort) while firming up during higher-frequency body motions like cornering and braking (improving control) — all without any electronic intervention or driver input.
• Precision-Machined Bodies: Each shock features precision-machined construction, reflecting the build quality KONI is known for in both OEM and performance aftermarket applications. This contributes to consistent performance and long service life.
• Hand-Tuned Valving: The internal valving is engineered and tuned by suspension experts, meaning the damping characteristics are specifically calibrated — not a one-size-fits-all generic replacement.
• Direct-Fit Replacement: The 8245 1421R is designed to bolt directly onto the 2017+ Tesla Model 3 and 2020+ Model Y without modification, preserving your garage time and eliminating the fitment headaches that can come with universal or poorly matched parts.
• Ride Quality and Safety: By improving both comfort across varied terrain and control during dynamic driving, this shock supports the safe handling characteristics your Tesla was designed to deliver — even as the factory dampers age and lose effectiveness.
• Upgrade Over Worn OEM Shocks: Tesla's factory suspension can feel noticeably degraded once original shocks wear. The KONI Special Active restores — and in many cases improves upon — that original dynamic balance, making it an ideal choice for daily drivers seeking a meaningful suspension refresh.

Specifications

• Brand: KONI
• Part Number (MPN): 8245 1421R
• SKU: KON8245 1421R
• Position: Front Right (Passenger Side)
• Technology: Frequency Selective Damping (FSD) — KONI Special Active series
• Condition: New
• Application: 2017+ Tesla Model 3 / 2020+ Tesla Model Y AWD & RWD

Fitment

This shock absorber is confirmed to fit the following vehicles:

• 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 Tesla Model 3 (all available drivetrain configurations covered by the AWD/RWD designation)
• 2020, 2021, 2022, 2023, 2024 Tesla Model Y (AWD and RWD variants)

This is the front right (passenger side) shock only. To complete a front axle replacement, you will also need the matching front left shock (8245 1421L). For a full four-corner refresh, KONI also offers a compatible rear shock for these vehicles (8245 1422). If you prefer a firmer, more performance-oriented setup, KONI's Sport (Yellow) series is available separately for the same fitment. Not sure which option is right for your build? Contact ThreePiece.us before ordering — our team can help you select the correct parts for your specific trim and driving goals.

What's in the Box

• 1x KONI Special Active Front Right Shock Absorber (8245 1421R)

Note: This listing is for a single shock absorber. Springs, top mounts, and other hardware are not included unless explicitly stated. Purchase two units if replacing both front shocks.

Why Buy from ThreePiece.us

• Free Shipping on Every Order: No minimum required — your KONI shock ships free, no matter what.
• Affirm Financing Available: Spread your purchase over time with flexible Affirm payment plans, so upgrading your Tesla's suspension doesn't have to wait.
• Expert Fitment Guidance: Unsure whether you need the Special Active or Sport series, or whether this part covers your specific Model 3 or Model Y build date? Reach out to our team before you order — we're here to make sure you get the right part the first time.
• Trusted Brands Only: We carry KONI and other reputable suspension brands so you can buy with confidence, knowing you're receiving a genuine, quality product.

Frequently Asked Questions

Q: Does this shock fit both the Tesla Model 3 and Model Y?
A: Yes. KONI part number 8245 1421R is confirmed to fit the 2017 and newer Tesla Model 3 as well as the 2020 and newer Tesla Model Y in both AWD and RWD configurations. If you have a specific build date or trim you're unsure about, contact us before ordering.

Q: Do I need to buy two shocks to replace both front shocks?
A: Yes. This listing covers the front right (passenger side) shock only. For a full front axle replacement, you'll need to add the front left shock, KONI part number 8245 1421L, sold separately. Replacing both front shocks at the same time is generally recommended for balanced handling.

Q: What makes the Special Active different from KONI's Sport (Yellow) shock for the same car?
A: The Special Active series uses KONI's Frequency Selective Damping technology, which automatically adjusts damping without driver input — making it well suited for daily driving where road conditions vary. The Sport (Yellow) series is a firmer, more performance-oriented option. Both are available for the Tesla Model 3 and Model Y; the best choice depends on your driving priorities.

Q: Is professional installation required?
A: KONI designs the 8245 1421R for direct-fit installation on compatible Tesla vehicles, which simplifies the process considerably. That said, front shock replacement typically involves working with the suspension strut assembly and may require spring compressors and alignment checks afterward. If you're not experienced with suspension work, professional installation is advisable to ensure safety and proper alignment.