Turbocharging the Nissan MR20DD Engine, Part 4, The Turbo System

Zach tig welded everything, back purging the tubes for the best penetration and strength.  He welded things from the inside and outside, then hand-ported everything for the best possible flow.  It’s hard to tell from pictures, but the flow is way less obstructed than when things were stock.

Here is the turbo with the modified manifold dummied up on the engine.  Pretty cool right?

Now the turbo and manifold are test fitted to a Sentra in the garage and a 3″ 304 stainless downpipe is fitted.

The dowpipe has a lot of clearance so rattling will not be an issue and all the OEM heat shields can remain in place.  We also added a bung for a wideband AFR sensor to make tuning not an issue.  We made sure there was plenty of wrench clearance around our turbo system and that the OEM bolts were accessible so working on things would not be hard if it was needed later.