22-24" with straight fittings on both ends. Straight adapter fitting threaded into the turbo. You'll be able to go on the "cold" side of the compressor housing away from the exh manifold (as shown above). On the autoX car I had to go between the comp housing and the exh. manifold because the line was shorter and because the T04 comp housing is huge (it fit under/around the T3).
Use mapp gas or similar, careful bit of heating/cooling on the plug/block, and then clean out the hole, tap in an allen wrench, tap with a hammer, should come right out. I did one a couple weeks ago, was shocked how easy it was with the right tools.
If you use a 90 degree fitting into the block, stick a screw driver into the timing belt cover bolt hole and break a chunk off the cover. Or remove the cover.

I just broke it since both I've done were already cracked. Then I put the piece back on, and put the bolt back in once the fitting is in place.
-3AN line with -4AN fittings works fine (premade line, crimped ends). I've also used -4 line with -4 fittings on a custom line mikeP had made for me at the machine shop, but that was a bit more expensive. But nice that I can change the fittings as needed.