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Audi C8 RS 6 Quattro 4.0T Performance Engine Parts

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ES#3691644 - 856804-5003S  - Garrett GTX3584RS Turbocharger  - Garrett GTX3584RS Turbocharger; V-Band Inlet and V-Band Outlet Turbine Housing; 1.21 A/R. Garrett # 856804-5003S - Garrett - Audi Volkswagen MINI

Garrett GTX3584RS Turbocharger; V-Band Inlet and V-Band Outlet Turbine Housing; 1.21 A/R. Garrett # 856804-5003S Used for custom, big turbo applications only - ECS Tuning does not offer support on tuning, fueling, exhaust manifold, etc

Brand:
Garrett - Corporate Logo
ES#:
3691644
Mfg#:
856804-5003S
Ships in 6 Business Days
$2881.99 USD
This product is lifetime replacement eligible Lifetime Replacement
ES#5457431 - UVM.63MM.X2 - Universal Valved Muffler Kit - Single Inlet / Single Outlet - 2.5" (63mm) - 2 Mufflers - Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button - Valvetronic Designs - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Upgrade your ride with the Valvetronic Designs universal valve muffler kit, a premium T304 stainless steel solution that delivers an aggressive, valved exhaust note at the click of a button

Brand:
Valvetronic Designs - Corporate Logo
ES#:
5457431
Mfg#:
UVM.63MM.X2
In Stock
ON SALE! SAVE 10%
$599.99

This product was last offered at the strikethrough price on
08-25-2026

$539.99 USD
Free Shipping
ES#4745515 - IEINCY2 - IE Turbo Inlet Pipes - C8 RS6/RS7 - Provides an instant 28.46% increase in flow compared to the stock inlets, and an impressive 88.46% flow increase when paired with an iE intake and inlet combo. - Integrated Engineering - Audi

Provides an instant 28.46% increase in flow compared to the stock inlets, and an impressive 88.46% flow increase when paired with an iE intake and inlet combo. Designed for 2021-2022 models only

Brand:
Integrated Engineering - Corporate Logo
ES#:
4745515
Mfg#:
IEINCY2
In Stock
$419.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4144932 - SN0-310-BRD - Stage 3 Boost Cooler (EFI - Port Injection) - Braided Line - Brings true 2D mapped water-methanol injection delivery to your EFI (Electronic Fuel Injected) and forced induction vehicle - SnowPerformance - Audi BMW Volkswagen MINI

Brings true 2D mapped water-methanol injection delivery to your EFI (Electronic Fuel Injected) and forced induction vehicle

Brand:
SnowPerformance - Corporate Logo
ES#:
4144932
Mfg#:
SN0-310-BRD
In Stock at Vendor
$833.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2764288 - MM0CU - Universal Oil Cooler - 10 Row - Upgrading cooling for your engine oil - Mishimoto - Audi BMW Volkswagen MINI

Upgrading cooling for your engine oil For custom applications only. Not a direct bolt on.

Brand:
Mishimoto - Corporate Logo
ES#:
2764288
Mfg#:
MM0CU
In Stock
$410.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4135253 - GRT-TBO-K51 - Garrett GEN2 GTX3076R Dual Ball Bearing turbocharger - Garrett GEN2 GTX3076R dual ball bearing turbocharger with a T04E frame (4" inlet and 2" outlet compressor housing) and a .61 A/R Divided (Twin-scroll) V-Band Inlet and GT 3" V-Band outlet turbine housing (Ni-Resist Material). - ATP - Audi Volkswagen

Garrett GEN2 GTX3076R dual ball bearing turbocharger with a T04E frame (4" inlet and 2" outlet compressor housing) and a .61 A/R Divided (Twin-scroll) V-Band Inlet and GT 3" V-Band outlet turbine housing (Ni-Resist Material). Used for custom, big turbo applications only - ECS Tuning does not offer support on tuning, fueling, exhaust manifold, etc

Brand:
ATP - Corporate Logo
ES#:
4135253
Mfg#:
GRT-TBO-K51
Ships in 6 Business Days
$2265.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#2764082 - MM0CUL - Universal Oil Cooler - 19 Row - Serious engine oil cooling for the most demanding engines - Mishimoto - Audi BMW Volkswagen MINI

Serious engine oil cooling for the most demanding engines For custom applications only. Not a direct bolt on.

Brand:
Mishimoto - Corporate Logo
ES#:
2764082
Mfg#:
MM0CUL
In Stock at Vendor
$536.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#4643362 - 034-105-4052 - Stainless Steel Racing Catalyst Set - he Stainless Steel Racing Catalysts offers increased horsepower and torque throughout the powerband, reduced turbocharger lag, improved throttle response, and enhanced exhaust note. - 034Motorsport - Audi

he Stainless Steel Racing Catalysts offers increased horsepower and torque throughout the powerband, reduced turbocharger lag, improved throttle response, and enhanced exhaust note. 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
4643362
Mfg#:
034-105-4052
Back Ordered
ON SALE! SAVE 10%
$2320.00

This product was last offered at the strikethrough price on
08-17-2026

$2088.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4932367 - EXH-DP-0049-CAT - CTS Turbo C8 Audi RS6/RS7 High-Flow CATS - T304 stainless steel construction - 200 cell catalytic converters - CTS - Audi

T304 stainless steel construction - 200 cell catalytic converters

Brand:
CTS - Corporate Logo
ES#:
4932367
Mfg#:
EXH-DP-0049-CAT
Ships in 7 Business Days
$1899.99 USD
Free Shipping
ES#4500516 - 30-3326 - AEM Water/Methanol Injection System - High-Flow Low-Current WMI Solenoid - 200PSI 1/8in-27NPT In/Out - AEM Electronics  - Audi BMW Volkswagen MINI Porsche

High-Flow Low-Current WMI Solenoid - 200PSI 1/8in-27NPT In/Out

Brand:
AEM Electronics  - Corporate Logo
ES#:
4500516
Mfg#:
30-3326
In Stock at Vendor
11% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$149.99

This product was last offered at the strikethrough price on
08-28-2026

$132.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#3698456 - 003779ECS11 - ECS Tuning Universal Catch Can Drain System - Make draining your ECS or Turner Catch Can simple with this comprehensive kit - ECS - Audi Volkswagen MINI

Make draining your ECS or Turner Catch Can simple with this comprehensive kit 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
3698456
Mfg#:
003779ECS11
In Stock
ON SALE! SAVE 25%
$71.99

This product was last offered at the strikethrough price on
06-13-2026

$53.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
ES#4405005 - ECU-40T-EA825-RS - APR ECU Upgrade - 4.0T EA825 V8 (RS) - Max gains of +112-210 AWHP and +145-225 AWFT-LBS depending on octane - APR - Audi

Max gains of +112-210 AWHP and +145-225 AWFT-LBS depending on octane Call In Or Chat For Best Price!
This upgrade must be performed at ECS Tuning's facility in Ohio.
For vehicles up through the 2023 model year only.

Brand:
APR - Corporate Logo
ES#:
4405005
Mfg#:
ECU-40T-EA825-RS
In Stock
$1499.99 USD
This product is lifetime replacement eligible Lifetime Replacement
ES#4465415 - C8-4.0T - Unitronic Performance Software - Flashed @ ECS - Choose the stage that meets your power goals! - Unitronic - Audi

Choose the stage that meets your power goals! This tune requires the vehicle to be dropped off at ECS Tuning's facility in Ohio and picked up the next

Brand:
Unitronic - Corporate Logo
ES#:
4465415
Mfg#:
C8-4.0T
In Stock
ON SALE!
Starting at $1450.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Performance Engine Parts

Our name says it all. That's why ECS Tuning is dedicated to providing our customers with the broadest possible assortment of engine tuning options at a range of prices and options to fit any budget. Start small and grow your car into something special with performance engine upgrades from a company that has tuning in its name and its blood.

ECS Tuning is not affiliated with any automobile manufacturers.
Manufacturer names and/or part numbers are used only for identification purposes.

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