"Methanol injection" refers to the process of injecting methanol, a type of alcohol, into an engine or combustion system. It is used to enhance performance, increase power output, and cool the system. Full definition
The intercooler is augmented by a ProMeth volute methanol injection system using a Chiseled Performance tank. (mustangandfords.com)
Moreover, RB25DET stock internals will bear even 500 horsepower, and if you use water methanol injection kit, then even more than 500 HP. (mywikimotors.com)
Running on 120RON race fuel and using water methanol injection, that should translate into a power output of between 550bhp and 600bhp, delivered at nearly 8000rpm. (evo.co.uk)