AUDI 4K0521101T Rear Drive Shaft Propeller RS7 4K8 4.0L 21K
fits model: Awd. make: Audi. year: 2021–2025.
( Manufacturer Part Number: 4K0521101T ), ( Type: Driveshaft ), ( Oe/oem Part Number: 4k0521101t, 4k0521101k ), ( Transmission Type: Automatic ), ( Placement On Vehicle: Lower, Rear ), ( Country Of Origin: Germany )
Review AUDI Rs7 4k8 4.0l Rear Drive Shaft Propeller Miles Oem fits AWD 2021–2025
The **Audi 4K0521101T Rear Drive Shaft (Propeller Shaft) for the 2021 2025 RS7 4.0L (4K8) AWD** is a precision-engineered, high-performance drivetrain component designed exclusively for Audi s flagship sports sedan, the RS7, which combines cutting-edge technology with raw, exhilarating power. This propeller shaft is a critical link in the vehicle s advanced all-wheel-drive (AWD) system, transmitting torque from the 4.0-liter twin-turbocharged V8 engine paired with the optional 8-speed Tiptronic S or dual-clutch S tronic transmission to the rear axle while ensuring seamless synchronization with the front-wheel-drive system via the Haldex coupling. Crafted from high-grade, heat-treated steel, the shaft features a robust, multi-spline design that maximizes strength and durability, capable of withstanding the immense forces generated by the RS7 s 600 horsepower output and aggressive driving dynamics. The proprietary Audi engineering ensures optimal balance between rigidity and flexibility, minimizing vibrations and torsional deflection even under extreme acceleration, high-speed cornering, or aggressive launch conditions. This propeller shaft is equipped with a **4K0521101T** part number, which corresponds to Audi s latest generation of drivetrain components, incorporating advanced materials and manufacturing techniques to meet the demands of both performance and longevity. Whether used in original equipment applications or as a high-quality replacement for vehicles requiring maintenance or upgrades, this shaft is engineered to deliver the same level of precision and reliability that defines the RS7 s legendary driving experience. Its seamless integration with the RS7 s advanced AWD system ensures that power is delivered instantaneously and efficiently, reinforcing the vehicle s reputation as a masterpiece of automotive engineering.
### **Pros and Cons of buying a Audi RS7 (4K0/4K8, 4.0L V8, 2021 2025, Rear Drive Shaft/Propeller)**
#### **Pros**
1. **Exceptional Performance**
The RS7 is one of the most powerful and fastest production Audi models, with the **4.0L V8 twin-turbo engine** producing **591 610 hp** (depending on the year) and **553 lb-ft of torque**. It accelerates from **0 60 mph in under 3.0 seconds** (0 124 mph in 10.5 seconds) and can exceed **186 mph** with the right setup. The **48V mild-hybrid system** improves efficiency without sacrificing raw power.
2. **Premium Build Quality & Interior**
Audi s **Quattro AWD system** ensures near-perfect traction, and the **rear propeller shaft/drive shaft** (part of the AWD setup) is robust, though it s not as high-revving as a front-drive setup. The interior is **luxurious**, featuring **high-quality materials**, **premium leather**, **Nappa leather seats**, and **adjustable ambient lighting**. The **Virtual Cockpit Plus** and **MMI Nav Plus** provide a cutting-edge infotainment experience with a **12.3-inch touchscreen** and **12.9-inch digital gauge cluster**.
3. **Advanced Technology & Safety**
The RS7 comes standard with **Audi s latest safety tech**, including:- **Audi Pre Sense (collision avoidance)**
- **Lane Keeping Assist & Traffic Jam Assist (semi-autonomous driving)**
- **360-degree camera system**
- **Adaptive cruise control with stop-and-go**
- **Blind Spot Monitoring & Rear Traffic Alert**
The **rear propeller shaft** is part of the **Quattro system**, which enhances stability, especially in high-performance driving.
4. **Exclusive RS7 Badging & Styling**
The RS7 stands out with its **aggressive front grille, carbon fiber accents, unique alloy wheels (20-inch standard, 22-inch optional), and aerodynamic enhancements** (active rear spoiler, diffusers). The **rear propeller shaft** is a subtle but important part of its AWD setup, contributing to its **sporty, track-ready stance**.
5. **Comfort & Refinement**
Despite its raw power, the RS7 is **exceptionally refined**, with **low road noise**, **smooth power delivery**, and **adjustable suspension** (adaptive damping). The **rear propeller shaft** is well-engineered to handle the torque without excessive vibration, making long drives comfortable.
6. **Resale Value & Prestige**
Audi RS models hold their value well due to their **limited production, exclusivity, and performance reputation**. Owning an RS7 carries **prestige**, and the **rear propeller shaft** (part of the AWD system) is a key selling point for enthusiasts who value **all-wheel capability**.
7. **Customization & Modification Potential**
The RS7 is a **fan favorite for tuning**, with aftermarket support for **engine upgrades (turbocharger swaps, forced induction), suspension tuning (coilovers, lowering springs), and exhaust modifications**. The **propeller shaft** can be upgraded for better durability if modified aggressively.
---
#### **Cons**
1. **High Cost of Ownership**
- **Purchase Price:** New RS7 models start around **$120,000 **, and used examples (2021 2025) still command **$80,000 $120,000 ** depending on mileage and condition.
- **Maintenance & Repairs:** Audi s **premium parts and labor** make repairs expensive. The **4.0L V8 twin-turbo engine** is complex, and **AWD components (including the propeller shaft)** require specialized knowledge.
- **Insurance:** High-performance luxury cars like the RS7 have **premium insurance costs** due to their value and repair expenses.
2. **Fuel Consumption & Running Costs**
- The RS7 **averages 12 14 MPG combined** (city/highway), making it **one of the least efficient V8 cars** on the market. With **$4 $5/gallon gas**, fuel costs add up quickly.
- **Oil changes, turbo maintenance, and AWD fluid replacements** are frequent and costly.
3. **Complexity & Reliability Concerns**
- The **4.0L V8 twin-turbo engine** is **powerful but prone to issues** if not maintained properly (turbo failure, oil leaks, carbon buildup).
- The **AWD system (including the propeller shaft)** is robust but **not as durable as a front-drive setup** in extreme off-road conditions. Over time, **U-joints and CV joints** may wear out.
- Some early **2021 2022 models** had **software glitches** in the **MMI system**, though Audi has since improved reliability.
4. **Limited Practicality for Daily Use**
- The **RS7 is a performance car first**, not a family hauler. The **rear propeller shaft** adds weight, and the **V8 s torque** can make city driving **less nimble** than a smaller car.
- **Parking is challenging** due to its **large size (198.8 inches long)**.
- **Fuel efficiency is poor**, making it **less practical for long commutes**.
5. **Depreciation Over Time**
While Audi RS models hold value better than most, **luxury performance cars still depreciate significantly**. A new RS7 can lose **30 40% of its value in 5 years**, though a well-maintained used example can still be a **great investment**.
6. **Potential for Overkill**
- If you **don t need 600 hp**, the RS7 is **more car than necessary** for most drivers.
- The **propeller shaft (part of Quattro AWD)** is great for **snow and wet conditions**, but if you **rarely drive in harsh weather**, the extra cost may not be justified.
7. **Aftermarket & Modification Risks**
- While the RS7 is **great for tuning**, **aggressive modifications (big turbos, forced induction) can void warranties and damage the propeller shaft/AWD system**.
- **Suspension modifications** (lowering springs, coilovers) can affect **ride comfort and handling balance**.
---
### **Conclusion & Recommendation**
#### **Who Should Buy the Audi RS7 (2021 2025, 4.0L V8, Rear Propeller Shaft)?**
**Enthusiasts who prioritize raw performance** and don t mind high running costs.
**Drivers who want a **luxury grand tourer with AWD capability** (the propeller shaft ensures strong rear traction).
**Those who appreciate **premium build quality, cutting-edge tech, and exclusivity**.
**People who plan to **modify the car** (engine, suspension, exhaust) and enjoy tuning.
**Those who live in **snowy or wet climates** and value Quattro AWD.
#### **Who Should Avoid the Audi RS7?**
**Budget-conscious buyers** the **high purchase price, insurance, and maintenance costs** add up.
**Daily commuters who prioritize fuel efficiency** the **12 14 MPG is unacceptable** for long-distance driving.
**Families or those needing a practical vehicle** the **size, weight, and performance focus** make it impractical.
**Drivers who dislike **complex cars** the **AWD system, turbo engine, and electronics** require **regular maintenance**.
**Those who don t enjoy **high-performance driving** the **0 60 mph in 3 seconds** is thrilling but **not for everyone**.
#### **Final Recommendation**
The **Audi RS7 (2021 2025, 4.0L V8, rear propeller shaft)** is a **masterpiece of performance and luxury**, but it s **not for everyone**. If you **love Audi s AWD system, want a **track-capable grand tourer**, and can afford the **high costs**, it s an **incredible choice**. However, if you **prioritize practicality, fuel efficiency, or a more affordable luxury experience**, consider alternatives like:
- **Audi S8 (more refined, slightly less power, better MPG)**
- **BMW M8 (similar performance, different driving dynamics)**
- **Mercedes-AMG S63 (more tech-focused, slightly better efficiency)**
**If you re set on the RS7, buy used (2023 2025) for better tech and reliability, and budget for **$10,000 $15,000/year in maintenance** to keep it running smoothly.** The **rear propeller shaft is a key part of its AWD system**, so ensure it s **inspected regularly** especially if modifying the car.
Details:
2023 Audi RS7 Sport back Base 4.0L V8 - Electric/Gas. Please carefully review the photos and of items condition fitments before making a purchase to avoid any misunderstandings. Local Pick-up: If you prefer local in-person pickup, it is possible. 2025 Audi RS7 Sport back Performance 4.0L V8 - Electric/Gas.
In such cases, we'll reach out to you after the purchase discuss delivery costs. The left side means the Drivers and Right Passenger mileage information about donors car can be found on label in pictures. 2024 Audi RS7 Sport back Performance 4.0L V8 - Electric/Gas.
part #: 4k0521101t prices
- $849.99-$1998.89
specifications universajoin:
- for models: Awd
- for makes: Audi
- for years: 2021-2025
- mpn: 4k0521101t
- type: Driveshaft
- oe/oem part number: 4k0521101t, 4k0521101k
- transmission type: Automatic
- placement on vehicle: Lower, Rear
- country of origin: Germany
payments universajoin:
- wallet: Apple-pay
- other
- credit card: Mastercard
shipping universajoin:
- type: Fixed
- class: Standard
- service: FedEx Ground / FedEx Home Delivery
- carrier: FedEx
- cost: $97.00
- transit: 5-9 Days
general universajoin:
- condition: Used
- Transmission Drivetrain > Driveshafts Parts > Driveshafts
returns universajoin:
- paid by: Buyer
- policy: Returns Accepted
- time: 30 Days
offer universajoin:
- started: February 14, 2026
- availability: In Stock
- quantity: 1
- sold: 0
- best offers: True
- options: Ship-to-home
seller universajoin:
- rating: 99.8%
- city: River Grove, Illinois
- # reviews: 10916
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