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This photo shows the complicated exhaust routing involved with a typical turbo. The wastegate bypasses extra exhaust gasses from the header collector, allowing only the correct amount of exhaust into the turbo housing, which is wrapped in the heat blanket. The compressor housing outlet, welded to the intercooler tubing, can be seen to the right of the wastegate with the pressurized steel hard line for oil coming from the engine just in front of the number four header tube. Try changing spark plugs in there!