Global B E99 Flex Fuel - C8/CT5-V & CT4-V Blackwing/Escalade V

We are proud to present the ability for anyone to do flex fuel in the E99 ECM for GM vehicles! The cornerstone of this setup is a modified operating system that allows traditional pinning of the ECM which will stay active as long as the operating system for the ECM is overwritten at a later point in time. Once the modified operating system is flashed (requires the use of a HP Tuners MPVI4 or RTD4), the tune can be edited just like any legacy ECM to activate flex fuel! This means no other inputs have to be taken over and any exhaust valves stay fully functioning like stock.

The base purchase is the modified OS itself which is deployed through the HP Tuners TDN (tune delivery network). Once you upload any file from the target vehicle to our TDN, you'll receive back a file that only supports write entire and is not downloadable. You'll also receive a file that you CAN download that has all the necessary settings turned on without the modified operating system. This allows us to protect our work while making it available to everyone.

As noted, you will need to have a RTD4 or MPVI4 for this to work. Should you need a MPVI4, we can provide you with one. If you also need the credits, we can preload them to your account. You will need to provide the VIN for the vehicle because we will use it to validate your purchase relative to the uploaded file.

DSX Tuning shipping & returns

• Shipping: in-stock orders placed before 3pm CST usually ship the same day. Back-ordered items ship as soon as they are available.
• Returns: unopened parts within 30 days of receipt, with a 20% restocking fee once the order has shipped. Original shipping is not refunded and the customer pays return shipping. "Unopened" means the original packaging is undisturbed and the part was never installed.
• Cancellations: orders not yet shipped (back-orders included) carry a 5% cancellation fee.
• Not returnable: custom-made or customized items.
• Warranty: DSX-made parts are covered against manufacturing and assembly defects for life for the original buyer. Installation damage, modified parts, cut or rubbed harnesses and fuel lines, and water damage to electronics are not covered.

To start a return or ask a question, contact us with your order number.