FWIW I'm using an rpm perf for my turbo 383 and the distribution is beautiful according to my plugs. I use a sheet metal elbow and 5.0 TB. I have a friend who has also had the best luck with distribution and mpg with a DP on his turbo 340. My take away is use whatever intake you would use based on the goals for the car with a carb and not sweat the efi. Other people may have had a different experience.