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CA18DET
The 1.8 L CA18DET was the last version of the CA engine to be released. It produces 175 hp (130 kW) and 168 ft.lbf (228 Nm). It received a brand new DOHC aluminum head with 16 valves. The turbocharger was also upgraded to a Garrett T25 unit for increased flow capacity, and as such, was fitted with an intercooler to help volumetric efficiency. Fuel was delivered via Multiport Fuel Injection.
Alot of people go aftermarket - wolf3d, microtech etc etc… These are all pretty expensive and IMO not worth it. The standard Nissan ECU is a pretty ingenious piece of gear and now thanks to the likes of Cam McKinnon and Pete Liebig you can get it modified to suit your purpose 
Garret GT2540R Specs
Ball Bearing
Watercooled.
Turbine Housing: 0.86a/r.
Compressor Housing: 0.70a/r.
Internally Wastegated.
Rated: 440hp.
Flange: T25/T28
So you’re looking for a custom Exhaust Manifold(extractors) for your ca18det? You’ll find a heap of custom manifolds such as the one listed above. The beauty of this type of manifold is that the turbo for your ca18det sits in the same position and bolts straight on with no modifications.
