Thanks for contacting us! We'll get back to you as soon as possible

RennTech ecu+ upgrade - ECU+ Upgrade for the 2021-2023 GLS 63 AMG

}

RennTech dyno chart for the GLS 63 ECU+ upgrade - ECU+ Upgrade for the 2021-2023 GLS 63 AMG

}

RennTech ecu+ upgrade, view 2 - ECU+ Upgrade for the 2021-2023 GLS 63 AMG

}

RennTech ECU+ Upgrade 2021-2023 Mercedes-AMG GLS 63 X167

Ask an expert

Brand: RennTechSKU / Part #: 54.167.GLS63EQ

Regular price: $3,724.80
Regular price: ~~$3,840.00~~
Sale price: $3,724.80
Unit price: per

Apply at checkout

Subtotal: $3,724.80

Quantity:

RennTech ECU+ Upgrade 2021-2023 Mercedes-AMG GLS 63 X167

Subtotal: $3,724.80

Not sure it fits? Text us your VINSee all fitment

Questions before you buy? Talk to a specialist.

Fitment and product questions · 9am–6pm Pacific

Call(310) 231-0292 Text(310) 886-3111 ChatLive chat

Price match: found it cheaper?
Secure checkout · Shop Pay · Affirm
AutoTalent since 2006

Free Shipping

Free standard shipping on orders over $99

Coupon Code on First Order

Price Match Guarantee

Free shipping on $99+ order

30-days Returns

Overview

If you want more from the 2021-2023 GLS 63 AMG without touching the hardware, this RennTech ECU+ Upgrade is the cleanest way to get it. RennTech revises the factory calibration for the 4.0L M177 twin-turbo V8 EQ Boost, raising power and torque through the full band and keeping the smooth manners the car left the factory with. RennTech rates the car at 745 hp and 767 lb-ft with this upgrade. That is a gain of 97 hp and 54 lb-ft.

Key details

Rated at up to 745 hp and 767 lb-ft, gains of 97 hp and 54 lb-ft. The tuner holds your stock file alongside the RennTech file, plugs into the OBD2 port, and flashes whichever one you choose without pulling the ECU.

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
93 octane or better recommended for the full calibration

What is included

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

Specs

Part number	54.167.GLS63EQ
Engine	4.0L M177 twin-turbo V8 EQ Boost
Rated output	745 hp / 767 lb-ft
Gain	+97 hp / +54 lb-ft
Shipping weight	3 lb

Fitment notes

Fitment is as listed by RennTech for this part number. Your VIN is required with the order.

Fitment

Make	Model	Chassis	Year	Engine
Mercedes-Benz	GLS 63 AMG	X167	2021-2023	4.0L M177 twin-turbo V8 EQ Boost

Fitment

Year	Make	Model
2021–2023	Mercedes-Benz	GLS63 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.

Reviews & questions