I was wondering what pipe size recommend for a custom turbo manifold for a 420a?







Also would you need a fmu if I am gonna run ms with bigger injectors?

I'm sure there are plenty of people who have had success with FMU's in their setups. Personally, I like the phrase "Trust is good, control is better" I would get a reputable high flow fuel pump (Walboro or something like that) and a brand named FPR. Set it to the stock setting (45-lbs or something like that?) and install your MS. They should adjust it for you while your getting it tuned. If you're planning on tuning it yourself, I highly recommend getting a copy of Engine Management Advanced Tuning by Greg Banish. It's a great introductory book into tuning and will help you determine what type of injectors to run, how much fuel pressure, injector timing... MS is an excellent platform and you get to learn a ridiculous amount about how petrol engines work.