BMW M5 | M8 Primary + Secondary Downpipes and Bootmod 3 or MHD Tune Package | FEMTO Package

Transform your BMW M5 or M8 with Project Gamma’s high-flow downpipes and ECU tuning package, designed for maximum performance, sound, and efficiency. Choose between Bootmod3 or MHD tuning at checkout — giving you the flexibility to tune your vehicle on the platform you prefer.

This package includes our premium primary and secondary downpipes engineered to significantly improve exhaust flow, turbo response, and overall power delivery when paired with tuning — all at a better value than purchasing components separately. Project Gamma

🚀 What’s Included

Project Gamma M5 / M8 Downpipes
Project Gamma downpipes for the M5 and M8 models utilize 3” high-flow construction with precision CNC-machined stainless steel v-band to pipe transitions. Our full 3D design maintains true diameter throughout the system, unlike competitors that neck down near the turbos — resulting in superior airflow and performance gains when tuned. Project Gamma

• Constructed from 304 stainless steel for durability and corrosion resistance

• Designed for high output and tuning applications

• Expect gains of approximately 50+ HP and 60+ lb-ft torque when properly tuned

⚙️ Tuning Options

Select your preferred ECU tuning platform:
✔ Bootmod3
✔ MHD

Both options allow you to properly calibrate your vehicle for downpipes and unlock optimized performance. An ENET cable and compatible laptop or device are required to flash the tune. Contact us for any questions about cable compatibility. Project Gamma

🔧 Stage 2 Recommendation:
2-step colder spark plugs gapped to 0.22 are recommended for Stage 2 applications.

🛠 Installation & Notes

• Downpipes require proper tuning to avoid CEL and optimize gains

• Installation should be performed by a qualified technician for best results

• This bundle does not include intakes or other bolt-ons

🔥 Heat Protection Option

The product shown in some images features ceramic coating. To protect your engine bay from excessive heat, we strongly recommend adding the Ceramic Coating add-on at checkout — otherwise, the downpipes will come in a polished finish.

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.