🔥 T4 S400 .90 A/R Divided Turbo Exhaust Housing – For 83mm Turbine Wheel (Twin Scroll)

Unlock quicker spool-up and stronger throttle response with this T4 .90 A/R Divided Exhaust Housing, engineered for S400-frame turbochargers using an 83mm turbine wheel. Featuring a twin-scroll volute design and a standard T4 divided inlet, this turbine housing is perfect for street trucks, towing builds, or compound turbo setups that need fast boost with controlled drive pressure.

With a 4 5/8" (4.62") machined exhaust outlet, this housing is compatible with most downpipe flanges and ideal for diesel performance applications running BorgWarner-based S475, S478, or custom S400 turbos.

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🔧 Key Features:

• Fits BorgWarner S400 turbos with 83mm turbine wheels

• .90 A/R – optimized for quick spool and low-end torque

• T4 inlet flange – divided/twin-scroll for pulse-separated exhaust flow

• Volute-style twin-scroll housing for balanced drive pressure

• 4.62" (4 5/8") machined exhaust outlet flange

• Cast iron construction for high-heat durability

• Part Number: 177102

• Ideal for Cummins, Duramax, and Powerstroke turbo setups

• Great for single turbo applications or the atmospheric unit in a compound system

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📦 What’s Included:

• 1x T4 S400 Divided Exhaust Housing (.90 A/R, 83mm wheel fitment)

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