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for a complete turbo system you need at least:
turbocharger with proper AR ratios to prevent backpressure yet still provide boost with minimal lag.
wastegate, whether internal or external.
turbine manifold with proper flange to mate the turbocharger and/or external wastegate.
Rising rate fuel pressure regulator or larger injectors with a 1:1 fuel pressure regulator and a MAP sensor bypass valve. if you go with a standalone programmable ecu, you can bypass all of this except for the injectors.
downpipe for turbine exhaust
cone filter for turbine intake
blow off/bypass valve
boost gauge to help you set boost accurately.
for exhaust, you dont need a large bore exhaust pipe for low boost situations. the larger pipe helps evacuate the exhaust gas more efficiently, allowing the turbine to spin up more quickly due to zero backpressure. also realise that there is a problem with going too big, by the means of boost spiking and overboost. 2.5" to 3" is best.
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