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RennTech Power Module for the 2019-2023 CLS 450: red RennTech Power Module housing seen face-on

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RennTech Power Module in front of its box - RennTech Power Module for the 2019-2023 CLS 450

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Silver RennTech Power Module housing - RennTech Power Module for the 2019-2023 CLS 450

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Red RennTech Power Module from a three-quarter angle - RennTech Power Module for the 2019-2023 CLS 450

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RennTech Power Module 2019-2023 Mercedes-Benz CLS 450 C257

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Brand: RennTechSKU / Part #: 54.256.RPM.450

Regular price: $2,696.60
Regular price: ~~$2,780.00~~
Sale price: $2,696.60
Unit price: per

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Subtotal: $2,696.60

Quantity:

RennTech Power Module 2019-2023 Mercedes-Benz CLS 450 C257

Subtotal: $2,696.60

Not sure it fits? Text us your VINSee all fitment

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Overview

The RennTech Power Module (RPM) is a plug-in tune for the 2019-2023 CLS 450. It sits between the factory sensors and the engine computer and adjusts boost, timing, throttle and fueling on the M256, so it adds power without reflashing the ECU. RennTech rates the CLS 450 at up to 417 hp and 442 lb-ft with this upgrade, a gain of 50 hp and 74 lb-ft.

Features

Plug-in module with a vehicle-specific, pre-labeled harness
CNC-machined 6061 aluminum enclosure
Includes a bypass plug to return to stock performance quickly
Remove the harness and the car is completely back to factory
No ECU flash required

What is included

RennTech Power Module
Vehicle-specific wiring harness
Bypass plug

Specs

Part number	54.256.RPM.450
Engine	M256
RennTech rated output	417 hp / 442 lb-ft
Gain (RennTech)	+50 hp / +74 lb-ft

Fitment notes

For the CLS 450 (C257), 2019-2023 as listed by RennTech. Please include your VIN with the order so RennTech can confirm the exact application. Check the fitment table before ordering, and contact us if your car differs.

Fitment

Make	Model	Chassis	Year	Engine
Mercedes-Benz	CLS 450	C257	2019-2023	M256

Fitment

Year	Make	Model
2019–2023	Mercedes-Benz	CLS450

Not sure? Text us your VIN and we’ll confirm.

Shipping & returns

Shipping: Orders ship via UPS, FedEx or USPS, from our facility near Los Angeles or directly from the manufacturer. Rates for many items are weight-based and shown at checkout. If you need it by a certain date, text us before you order.

Returns: Unused items in brand-new condition and original packaging can be returned within 30 days of the invoice date, with a 25% restocking fee unless otherwise specified. In some cases we can offer a lower fee with the balance as store credit. Shipping charges aren't refundable in either direction unless approved by AutoTalent.

Not returnable: special-order or custom items, and anything that has been installed, modified or altered.

Cancellations: free if the item is out of stock or we miss the ETA you agreed to. Other cancellations carry a 5% processing fee to cover card fees we can't recover. Special-order items can't be cancelled.

Damaged in transit? Report it to the carrier and to us within 48 hours, keep all packaging, and don't send anything back without our written approval.

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