Hello!
well In Nissan engines...
S donates Carb...and GA16DS came with ECC (EGR) system
EGR System reduces emissions of nitrogen oxides (NOx). It introduces exhaust gases into the intake manifold where they dilute the air/fuel ratio. This reduces peak combusion temperatures, lessening the tendency for nitrogen oxides to form.
TBi is different thing......it got one injector which injects in TB...!
B/w....looks much better after wash...
Enjoy B13...!
Regards