W.3 Turbo Upgrade, M178 (Weistec)AMG GT, GTS, GTR Models The Weistec M178 W. 3 Turbo Upgrade unlocks the true potential of the 4. 0L Biturbo engine. Power gains are substantial, especially in the top end. The factory turbocharges are disassembled and fully inspected. The compressor cover and center cartridge are then machined to accept our 5 axis CNC machined 65mm impeller wheel. Externally, no changes are made to maintain a completely stock appearance. The new impeller wheel
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