I took an rs turbo to powers back in the day with braided mfi lines. It wouldn't pull over 190bhp. Ian and Matt changed them for stock ones and played about with it and boom.... 215bhp and 223lbs. They are a total waste of time.

when efi though you get to do things properly. My mk2 fiesta turbo has Aeroquip throughout the car with uprated lift pump and twin 044s in the boot with swirl pot.... I doubt I am going to have a fuel issue with that and grey injectors lol