Differences between 1.6 N/A and turbo are: Oil squirters, pistons (oil squirter reliefs for sure, but N/A might also be cast. Some TD pistons also have a thermal coating), larger oil pump (15%), oil pan (oil return fitting, and higher capacity in some cases), oil cooler (unless it's an automatic, then it probably already has one), turbo, downpipe, exhaust manifold, intake manifold, air filter box, valve cover (sometimes), oil vapor collector (round thing on valve cover), oil filter flange (needs take-off for oil line to turbo), exhaust valves (either plasma coated or sodium filled), valve seats, higher strength alloy head (just how much stronger/resistant to heat, nobody knows. The pre-ignition chambers might also be more heat resistant.), injectors (breaking pressure is higher), fuel injection pump (LDA for fuel enrichment), fuel injector lines (a couple might be shaped differently to clear the LDA), harmonic balancer (all turbos have one, some N/As don't), strengthened crankshaft (not too much info on this, but I believe both turbo and N/A are forged), misc. hoses, emblems, engine tuning/timing, etc.