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Up-pipe is a piping that connects the exhaust manifold with the turbo. Down-pipe is a piping that connects the turbo with the rest of the exhaust pipe. Exhaust gases leave the turbo from the down-pipe. The GT37 retains VGT functionality but sports a bigger turbine wheel and a larger, single compressor wheel. It sees lower shaft speeds and rarely overspeeds. The aftermarket path typically points toward the use of a fixed geometry turbo, and namely one of the many popular off-the-shelf BorgWarner S300
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