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This side shot gives a great view of the header and turbo configuration. The Turbonetics 91mm ceramic roller-bearing turbos are custom-tailored for this application, feature a standard impeller design, and are larger than their previous turbo 440. The use of alcohol also increases exhaust output by about 18 percent so they could step up to a larger exhaust turbine wheel, cutting back pressure without giving up any response. The turbos are lubricated by the engine's oiling system and use #4 AN lines to the housings and #10 AN lines back to the oil pan. Maximum boost pressure is 52-54 psi, which they will not see until the new car is finished. The turbos are controlled by a Turbonetics New Generation wastegate that flows substantially more than previous "Race Gates." Though they are the same size, they make use of a special three-angle valve job that moves more exhaust and prevents "boost creep."