LOL@Equal length manifold for a D17

YOull want a log manifold over some tubular manifold for the low boost your planning on having. the turbo isnt big enough to warranty some equal length custome manifold that will cost you $800+

That turbo will LONG Max out before you get near 400whp. that turbo is only good for 300whp at the most which will blow the D series up in no time.

If you decide to do a built motor, youll want to invest in REAL ENGINE MANAGMENT . RIght now, just do an FMU and a VAFC and see what you can get out of it, prob right around 200whp at 8psi.