Mercedes-Benz GT63 | E63 Downpipes and Project Gamma Tune Package

Project Gamma downpipes for the AMG GT63 / GT63S models feature a 4 to 3” construction along with a stainless steel v-band to pipe transition that is machined with CNC to precision. Our downpipes are the best bang for your buck mod available for your AMG GT63 / GT63S with gains from 50 Horsepower and 60 Torque when tuned. Rather than necking down closer to the turbos like most of our competitors, our downpipes present a full 3D design up to the last inches proving a greater increase in flow. These downpipes allow for cooler temperatures in the engine bay with the addition of heat shielding. Project Gamma downpipes are handcrafted to extreme rust resistance using 304 Stainless Steel.

Project Gamma Tune

With the Project Gamma custom tune, the vehicle will have power gains up to 180 HP with supporting mods.

The customer will receive a handheld device with the Project Gamma Tune and the factory tune. The vehicle can be flashed at any time.

If your item is in stock and the order is placed before 3 PM, it will ship the same day. Products that include ceramic coating are shipped the following business day. If the product or color you’re looking for is out of stock, you can join the waitlist by clicking the “Email When Available” button. We’ll notify you as soon as it’s back and provide an estimated restock time.

Custom Orders
For custom requests, please email us directly. We’ll review your order and provide an estimated delivery time based on the required manufacturing process.

Damaged, Incorrect, or Missing Items
If your order arrives damaged, incorrect, or missing parts, simply email us a photo along with your order number. We’ll arrange a refund or exchange right away. Contact us at info@ttmengineering.se and we’ll make it right.

Returns & Satisfaction
Unused and uninstalled products are eligible for a refund, exchange, or store credit. Unfortunately, once a product has been used or installed, we cannot accept returns or offer refunds. If you decide you don’t like a product after installation, it will not qualify for return.

Restocking Fee
A restocking fee of 20% of the original purchase price may apply to returned products. This fee covers the costs of processing and restocking. Please refer to our Policies Page for full details on exchanges and returns.