Description
VTT “GC” Turbocharger Upgrade – Mercedes M177 / M178 AMG
Supported Power Level (stock engines): up to 900WHP
Base Spec: Garrett G25-660
PTE-style Wheel Designation (Comp/Turb): 58/54
Ready to take your M177/M178 AMG to the next level—without core charges, long lead times, or restrictive factory housings? VTT’s 100% new-casting GC turbo upgrade keeps what AMG did right and removes the bottlenecks: restrictive inlets, inefficient bearing-housing oiling, undersized thrust design, and more. We add proprietary VTT revisions and cast at OE-level quality for a true bolt-on that retains near-stock spool and all factory connections (oil, water, downpipe, charge pipe).
Key Design Elements
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All-new castings with OEM restrictions removed (not oversized wheels in stock housings)
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Twin-scroll 310 stainless turbine housing for heat/corrosion resistance
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9-blade Mar-M 246 Superalloy turbine with modern aero for high flow + fast response
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9-blade point-milled compressor for maximum efficiency and surge resistance
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Direct connection to all factory lines (oil, water, downpipe, charge pipe)
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Improved bearing-housing oiling and upgraded thrust assembly
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No core charges — keep or resell your OEM units
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Once in full release, same/next-day shipping (verify stock at order time)
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12-month, unlimited-mileage, no-hassle warranty (defects in materials/workmanship; misuse/overspeed excluded)
What’s Included
Recommended Supporting Mods
Fuel system upgrades, high-flow intake, downpipes, intercooler improvements, and ECU calibration. You’ll see gains on stock hardware, but peak power requires proper supporting mods.
Fitment
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2015–2020 AMG C63 / C63-S
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2017–2020 GLC63 / GLC63-S
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2015–2020 AMG GT / GT-S / GT-C
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