McLaren 12C ECU Flash Upgrade with PBox Times VRTuned.com April 18, 2016 Product Info, Tuning Tech The McLaren 12C ECU flash is just one upgrade that takes this 3.8L twin turbo supercar to a whole new level. Having ripped the 1/2 mile to 168mph in our 12C, we at Vivid Racing love to prove our product and provide customers with the same remarkable experience. This particular ECU upgrade was done for a McLarenLife forum member ...