VTT Mercedes Benz M177/78 “GC” Turbocharger Upgrade

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

• All-new castings with OEM restrictions removed (not oversized wheels in stock housings)

• Twin-scroll 310 stainless turbine housing for heat/corrosion resistance

• 9-blade Mar-M 246 Superalloy turbine with modern aero for high flow + fast response

• 9-blade point-milled compressor for maximum efficiency and surge resistance

• Direct connection to all factory lines (oil, water, downpipe, charge pipe)

• Improved bearing-housing oiling and upgraded thrust assembly

• No core charges — keep or resell your OEM units

• Once in full release, same/next-day shipping (verify stock at order time)

• 12-month, unlimited-mileage, no-hassle warranty (defects in materials/workmanship; misuse/overspeed excluded)

What’s Included

• 1 set of VTT “GC” turbochargers

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

• 2015–2020 AMG C63 / C63-S

• 2017–2020 GLC63 / GLC63-S

• 2015–2020 AMG GT / GT-S / GT-C

• Free US shipping on orders over $250.
• Free pickup at our Dallas shop, usually ready within 24 hours.
• Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
• Want it installed? Book the install at thegbmotors.com.

Full details are on our shipping and returns page.