Doc, for your Coupe with the 62mm SC pulley they would more than likely help. I had Bruce (TTM) install the looped rail and injectors on mine with the 185mm crank pulley and it definitely helped....would probably be something similar. EC also had mine for a few days for a dyno tune and everything was right as rain after that with the LT/ST Fuel Trims which were a concern with the larger injectors and tuning at first. I believe Anthony also had luck with Buckhead Imports tuning his single and stacked setups with the looped rail and larger injectors.