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RennTech ECU Upgrade for the 2015-2018 CLS 63 AMG: compact black RennTech HHT module, front view

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RennTech HHT ECU upgrade graphic with the tuner module - RennTech ECU Upgrade for the 2015-2018 CLS 63 AMG

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Black HHT tuner showing its status lights - RennTech ECU Upgrade for the 2015-2018 CLS 63 AMG

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Black HHT tuner from the front - RennTech ECU Upgrade for the 2015-2018 CLS 63 AMG

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Black OBD extension lead - RennTech ECU Upgrade for the 2015-2018 CLS 63 AMG

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RennTech ECU Upgrade 2015-2018 Mercedes-Benz CLS 63 AMG C218

Name: RennTech ECU Upgrade 2015-2018 Mercedes-Benz CLS 63 AMG C218
Brand: RennTech
SKU: ECU:54.218.CLS63BI.FL
Price: 2386.2 USD
Availability: InStock

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Vendor: RennTech

SKU: ECU:54.218.CLS63BI.FL

Regular price: $2,386.20
Regular price: ~~$2,460.00~~
Sale price: $2,386.20
Unit price: per

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Not sure it fits? Text us your VINSee all fitment

Subtotal: $2,386.20

Quantity:

RennTech ECU Upgrade 2015-2018 Mercedes-Benz CLS 63 AMG C218

Subtotal: $2,386.20

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Overview

If you want more from the 2015-2018 CLS 63 AMG without touching the hardware, this RennTech ECU Upgrade is the cleanest way to get it. RennTech revises the factory calibration for the 5.5L M157 twin-turbo V8, raising power and torque through the full band and keeping the smooth manners the car left the factory with. RennTech rates the CLS 63 AMG at up to 638 hp and 695 lb-ft with this upgrade, a gain of 33 hp and 49 lb-ft.

Watch it explained

Features

Revised ignition timing, throttle mapping, air-fuel ratios and boost control
Gains across the entire rev range, not just at peak
Developed on RennTech's own dyno and road tested
Keeps factory-like drivability and reliability for daily use

What is included

RennTech calibration for your car
Delivery as listed by RennTech for this model (HHT tuner or ECU flash)

Specs

Part number	54.218.CLS63BI.FL
Engine	5.5L M157 twin-turbo V8
RennTech rated output	638 hp / 695 lb-ft
Gain (RennTech)	+33 hp / +49 lb-ft

Fitment notes

For the CLS 63 AMG (C218), 2015-2018 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 63 AMG	C218	2015-2018	5.5L M157 twin-turbo V8

Fitment

Year	Make	Model
2015–2018	Mercedes-Benz	CLS63 AMG

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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