A mate of mine has just got himself a cheap and nasty turbo off ebay for his Nissan S13.

It doesn't have a take off on the compressor housing so I presumed you would just drill and tap it which I know would work.

However according to a friend of his who has a Norris Designs engine install he has the boost control between the actuator and inlet manifold.

I'm guessing either work but I'd just like to know the reason behind doing it Norris's way.