Brock’s Performance would not recommend using VP Racing Fuels MR12 as it only has a motor octane of 87. For a built motor application we recommend VP Racing Fuels MRX02, as it carries a motor octane of 98. This would be a sufficient octane for a built motor that has higher compression than stock. Brock’s Performance does not recommend the use of any oxygenated race fuels with nitrous oxide applications. For nitrous and turbo applications we recommend VP Race Fuels C16.