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Product Summary

Universal Fit, T4 Divided Turbine Housing Inlet Flange

  • Compressor: 78/102
  • Turbine: 83/75
  • Turbine 1.25 T4 Divided
  • Universal Crossover You Build It component Kit
  • Designed to Integrate with Most Common LS Swap Applications & Components

Comes as a Kit

Key Specs

Turbine Housing Inlet FlangeT4 Divided
Turbine Housing Outlet Flange4 Inch V-Band
Turbocharger StyleS400
Volute TypeTwin Scroll
Turbine Wheel Exducer Size75 mm

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Speedway Motors 91604127 Details

60331795 - The Next Gen CAST T4 7875

Next gen Turbine housing 1.25 AR T4 divided

  • Compressor: 78/102
  • Turbine: 83/75
  • Turbine Options:1.25 T4 Divided or T4 .96ar Open or Dual v-band .96ar
  • Compressor Outlet : 3" slip fit
  • Inlet Flange: T4 divided
  • Oil Feed fitting 1/8 npt to -4an
  • Oil Flange Std T4 drain.
  • Oil Thread Pitch for flange M8x1.25

91015027 T4 Turbo Transition Flange 3"

  • Flange is tapped 3/8"-16
  • For 3" OD tubing
  • A36 mild steel
  • Please be sure to check all dimensions in the drawing provided in the photos to verify compatibility with your application.
  • Minor gasket matching and or hand fitting of slightly oversized tubing may be necessary.

4258510HKR Holley’s new LS Turbo Exhaust Manifolds are made from cast iron and allow a simpler and easier way to add a turbo to your muscle car. These manifolds are made from High-Silicon-Moly ductile iron and are much more durable & retain more heat than fabricated headers. The manifolds kits include v-band clamps & flanges, heater hose heat shield, and header bolts. A turbo cross-over tube is used to connect the two manifolds (sold separately).

Choose the cross-over tube based on the transmission (and bell-housing) for optimal fit and ground clearance. The cross-over tubes are made from 16-gauge, mandrel bent 304 stainless steel and include a flex joint and v-band flanges welded on for an easy bolt-on fit. A universal cross-over component kit is also available for custom applications that need something a little different (requires fabrication & welding). These parts work with most common LS swap parts (i.e. motor mounts, swap oil pan, and accessory drive systems) & provide the basic building blocks needed to complete a custom turbo system for your GM LS engine.

Features:

  • Designed to Integrate w/ Most Common LS Swap Applications & Components
  • 3” V-Band Outlet – 2.25” V-Band Crossover Connections
  • Heat Shield to Protect Heater Hoses
  • Hardware Included – Stainless Steel V-Band Clamps, V-Band Flanges & Header Bolts
  • High-Silicon-Moly Ductile Iron Construction Retains Heat and is More Durable than Headers

4258517HKR Holley's new LS Turbo Exhaust Manifolds are made from cast iron and allow a simpler and easier way to add a turbo to your muscle car. These manifolds are made from High-Silicon-Moly ductile iron and are much more durable & retain more heat than fabricated headers. The manifolds kits include v-band clamps & flanges, heater hose heat shield, and header bolts. A turbo cross-over tube is used to connect the two manifolds (sold separately). Choose the cross-over tube based on the transmission (and bell-housing) for optimal fit and ground clearance. The cross-over tubes are made from 16-gauge, mandrel bent 304 stainless steel and include a flex joint and v-band flanges welded on for an easy bolt-on fit. A universal cross-over component kit is also available for custom applications that need something a little different (requires fabrication & welding). These parts work with most common LS swap parts (i.e. motor mounts, swap oil pan, and accessory drive systems) & provide the basic building blocks needed to complete a custom turbo system for your GM LS engine

  • Universal Component Kit
  • Choose Cross-Over Tube Based on Type of Transmission & Bell-Housing
  • Cross-Over Tubes Are 16 Gauge, Mandrel Bent 304 Stainless Steel & Include a Flex Joint & V-Band Flanges
  • Pre-Made Cross-Over Tube Provide Optimal Fit & Ground Clearance

42512280HKR Super Competition 180 Degree Mandrel U-Bends.Tubing Is Available In Mild Steel,Stainless Steel And Aluminized Steel.

  • Mandrel Bent Tubing
  • Wrinkle-Free Surface
  • 18 gauge

Mild Steel, 180 degree bend, Tube Size 3" OD, Radius 6", Leg A 6" Leg B 6", 18 Gauge

60312287 VSR 44mm Gen 2 Wastegate comes complete as a kit with flanges. base spring pressure is normally 12psi

  • Springs are included: Red 4psi, Green 6 psi, Yellow 6psi
  • Natural color spring in the unit is 6 and 6

60312358 S400 downpipe flange w/clamp T4 Flat(NonMarmon)

  • Downpipe for S400 chassis T4 Based Turbos 4"
  • Mild Steel

61760421 These straight flare adapters connect 1/8" pipe to straight -4 AN fittings. They are lightweight aluminum and feature a 37° sealing angle. Black finish will give your engine compartment the look you are after. Order your desired size.

  • Precision machined to ensure precise thread engagement
  • Lightweight aluminum fuel line hose connector
  • -4 AN to 1/8" aluminum pipe
  • 37° sealing angle guarantees a positive seal at maximum operating pressures
  • Available in Black anodized finish for a custom look

61760501 These straight flare adaptors connect 1/2" pipe to straight -10 AN fittings. They are lightweight aluminum and feature a 37° sealing angle. Black finish will give your engine compartment the look you are after. Order your desired size.

  • Precision machined to ensure precise thread engagement
  • Lightweight aluminum fitting
  • -10 AN to 1/2" aluminum pipe
  • 37° sealing angle guarantees a positive seal at maximum operating pressures
  • Available in Black anodized finish for a custom look

Included in this kit:

(1) 91015027 3 Inch Steel T4 Weld on Flange

(1) 4258510HKR LS Turbo Exhaust Manifold

(1) 4258517HKR LS Turbo Crossover Builder Kit

(1) 42512280HKR U Bend

(1) 60312287 44MM Gen2 Wastegate

(1) 60312358 T4 4 Inch Downpipe Flange

(1) 60331795 78/75 T4 Turbo 1.25AR

(1) 826551161 T4 Turbo Oil Drain 1/2"NPT

(1) 61760421 Black AN4 To 1/8" NPT

(1) 61760501 Black AN10 To 1/2" NPT

Charts

Speedway Motors 91604127 Specifications

KEY SPECS
MFG. Part #91604127
BrandSpeedway Motors
Turbine Housing Inlet FlangeT4 Divided
Turbine Housing Outlet Flange4 Inch V-Band
Turbocharger StyleS400
Volute TypeTwin Scroll
Turbine Wheel Exducer Size75 mm
Turbine Housing A/R Ratio1.25
Turbocharger Bearing StyleJournal Bearing
Wastegate Size44mm
GENERAL
Speedway Motors Catalog Part #916-04127
Compressor Housing IncludedYes
Compressor Housing MaterialAluminum
Compressor Housing FinishNatural
Turbine Housing IncludedYes
Turbine Housing MaterialCast Iron
Turbine Housing FinishNatural
Compressor Wheel Inducer Size78 mm
Compressor Wheel Exducer Size102 mm
Compressor Wheel ConstructionCast Aluminum
Compressor Outlet StyleSlip-Fit
Compressor Outlet Size3"
Ported Compressor HousingYes
Turbine Wheel Inducer Size83 mm
Wastegate TypeExternal
Oil Feed Fitting1/8" NPT to -4 AN
Oil Flange Thread PitchM8 x 1.25
Wastegate Actuator IncludedNo
Wastegate StyleMechanical
Wastegate Base MaterialStainless Steel
Wastegate Base FinishNatural
Wastegate Top Cap MaterialAluminum
Wastegate Top Cap FinishAnodized
Wastegate Top Cap ColorBlack
Spring Rates Included4 psi, 6 psi, 7 psi
Exhaust Adapter IncludedYes
Intake Adapter IncludedNo
Oil Adapters IncludedYes
Exhaust Manifolds IncludedYes
Crossover Pipe IncludedYes
Crossover Pipe Diameter2.25"
Exhaust Pipe Size3"
Downpipe Size4"
Welding RequiredYes
Sold in QuantityKit
Turbocharger SetupSingle