Vargas VTT BMW S55 “GCMAX” Turbocharger Upgrade Kit

Disclaimer: Vargas Turbo Technologies products are built to order and typically require 2–4 weeks for production before shipping. Order cancellations made within 7 weeks of purchase are subject to a 20% cancellation fee. Once a turbocharger has been completed, it will ship within 2 business days.

Cancellations requested after a turbo has been built will incur a 50% cancellation fee. This same 50% fee applies to all turbocharger returns, excluding warranty or verified defect claims, which are not subject to any fees.

All custom or special-order items, including but not limited to coated components, VTT-FAB single turbo kits, and custom driveshafts, are subject to a 50% restocking fee and are non-refundable once production has begun.

The Vargas VTT S55 GC-MAX Twin Turbocharger Upgrade Kit represents the most advanced evolution of the proven VTT GC platform, engineered to deliver true four-digit horsepower capability while retaining full factory-location, bolt-on installation. Developed using extensive data from the GC and GC+ programs, GC-MAX redefines what is possible on the BMW S55 engine without sacrificing spool, drivability, or reliability.

GC-MAX turbochargers feature completely redesigned housings with significantly enlarged internal flow paths, optimized A/R sizing, and a maximized 2.5-inch inlet diameter. Compressor size is increased to 67mm, while the turbine housing is fully retooled to accept a 54mm G25-series turbine wheel. This turbine architecture, shared with VTT’s S58 and S63 GC+ platforms, delivers exceptionally low exhaust backpressure, rapid spool characteristics, and airflow capacity far beyond conventional designs of similar size.

This same turbine and compressor wheel architecture has already supported over 1000 wheel horsepower on other BMW platforms while maintaining factory-like response. On the S55 engine, GC-MAX provides a true bolt-on solution capable of reaching 1000WHP on a stock long block with proper fueling, supporting modifications, and professional calibration, all without converting to a single turbo system.

Each GC-MAX kit is sold with no core charge, allowing you to keep or resell your factory turbochargers. The system installs directly to factory oil lines, coolant lines, downpipes, and charge pipe connections, preserving OEM serviceability. Production units are designed for stock availability, and every set is backed by a 12-month unlimited-mileage warranty covering material and workmanship.

Key Design Features

All-new high-flow housings with revised A/R and improved aerodynamics
310 stainless steel turbine housings for extreme thermal and corrosion resistance
54mm G25-spec Mar-M246 9-blade superalloy turbine wheels
67mm 9-blade point-milled compressor wheels optimized for high flow and surge resistance
Maximized 2.5-inch inlet diameter for improved airflow
Redesigned bearing housing oiling with upgraded thrust assembly
Direct bolt-on to factory oil, coolant, downpipe, and charge pipe connections
No core charge required
12-month unlimited-mileage warranty

Power Capability

Up to 1000 WHP on a stock engine with proper fueling, upgrades, and professional tuning

Package Includes

Matched pair of VTT GC-MAX turbochargers
VTT GC-MAX silicone intake tubes

Recommended Supporting Modifications

Upgraded fuel system components
High-flow intake system
Aftermarket downpipes
Upgraded intercooler
Professional ECU calibration

Fitment

BMW F87 M2 LCI, 2016–2019, S55
BMW F80 M3, 2012–2015, S55
BMW F80 M3 LCI, 2015–2018, S55
BMW F82 M4, 2013–2017, S55
BMW F82 M4 LCI, 2016–2019, S55
BMW F83 M4, 2013–2017, S55
BMW F83 M4 LCI, 2016–2019, S55

Engine: BMW S55 3.0L Twin Turbo
Configuration: Factory-location twin turbocharger upgrade
Sold as: Complete matched turbocharger set