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Product Summary

Universal Fit, T4 Turbine Housing Inlet Flange

  • Hot side kit includes all the major components necessary to fabricate the hot side of an LS turbo kit
  • Includes a 67/62 VS Racing turbo with T4 flange and is rated at 700 max flywheel horsepower
  • Hooker LS turbo manifolds along with Universal/Custom crossover pipe simplify hot side fabrication
  • 44 mm VS Racing wastegate is included to regulate boost pressure properly
  • CNC profiled T4 transition flange fits directly to 3” exhaust tubing and minimizes back pressure

Comes as a Kit

Key Specs

Turbine Housing Inlet FlangeT4
Turbocharger StyleGT35
Volute TypeOpen Scroll
Compressor Housing A/R Ratio0.72
Turbine Wheel Exducer Size62 mm

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Speedway Motors 91604123 Details

LS Hot Side Turbo Kit, 67MM Turbo, Universal Cross Over

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 -Hooker'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

Features

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

60335551 - VSR 67/62 Cast journal bearing offering .82ar T4 VBAND

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

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.

Included in this Kit:

(1) 91015027 - Weld on Flange

(1) 4258510HKR - Set of LS Turbo Exhaust Manifolds

(1) 4258517HKR - Turbo Crossover Tube Builder Kit

(1) 42512280HKR - 3 Inch U Bend

(1) 60335551 - 67/62 Turbo .82AR T4 Vband

(1) 60312287 - 44MM Wastegate Gen2

(1) 60312358 - T4 Downpipe Flange

Charts

Speedway Motors 91604123 Specifications

KEY SPECS
MFG. Part #91604123
BrandSpeedway Motors
Turbine Housing Inlet FlangeT4
Turbocharger StyleGT35
Volute TypeOpen Scroll
Compressor Housing A/R Ratio0.72
Turbine Wheel Exducer Size62 mm
Turbine Housing A/R Ratio0.82
Turbocharger Bearing StyleJournal Bearing
Wastegate Size44mm
GENERAL
Compressor Housing IncludedYes
Compressor Housing MaterialAluminum
Compressor Housing FinishNatural
Turbine Housing IncludedYes
Turbine Housing MaterialCast Iron
Turbine Housing FinishNatural
Compressor Wheel Inducer Size67 mm
Compressor Wheel ConstructionCast Aluminum
Compressor Outlet StyleSlip-Fit
Ported Compressor HousingYes
Wastegate TypeExternal
Oil Feed Fitting7/16"-24 IF to -4 AN
Wastegate Actuator IncludedYes
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 IncludedNo
Exhaust Manifolds IncludedYes
Crossover Pipe IncludedYes
Crossover Pipe Diameter2.25"
Exhaust Pipe Size3"
Downpipe Size4"
Welding RequiredYes
Clamps IncludedYes
Sold in QuantityKit