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Garrett
Garrett GT28R THWA O/V T25 / 5-Bolt 0.64 A/R (Hi Sil) Small Frame
$394.13
Garrett
Garrett GT28R Turbine Hsg Kit O/V T25 / 5-Bolt 0.64 A/R (Hi-Sil) (Special Order -Minimum Order Size)
$493.16
Garrett
Garrett GT28R THWA Kit O/V T25 / 5-Bolt 0.64 A/R (Ni-Resist)
$493.16
Garrett
grt827690-0002
$667.56
Garrett
Garrett GT28R Turbine Housing Kit O/V V-Band / V-Band 0.57 A/R (Ni-Resist)
$667.56
Garrett
Garrett GT28R THWA Kit O/V T25 / 5-Bolt 0.86 A/R (Hi Sil)
$493.16
Garrett
Garrett GT28R THWA O/V T25 / 5-Bolt 0.86 A/R (Hi Sil)
$394.13
Garrett
Garrett GTX3071R Gen II Turbo Assembly Kit V-Band / V-Band 0.61 A/R
$2,650.93
$2,226.78
Garrett
Garrett GTX3071R Gen II Turbo Assembly Kit T3 / V-Band 0.82 A/R
$2,589.58
$2,175.25
Garrett
Garrett GT30/35R 3.0in Turbine V-Band Flange Adapter
$78.86
Garrett
Garrett GT30R Turbine Housing Kit O/V T4 / V-Band 0.82 A/R (Hi Sil)
$607.53
Garrett
Garrett GT30R Turbine Housing Kit O/V T4 / V-Band 0.63 A/R (Hi Sil)
$607.53
The turbine housing shapes how exhaust energy drives your turbo, making it one of the most effective ways to change spool, drive pressure, and top-end flow without replacing the whole turbo. Replace a cracked or eroded housing, or choose a different A/R to suit your power goals, towing needs, or engine modifications. Housings must match your turbo's brand, frame, and turbine wheel, along with your manifold flange, scroll design, and wastegate setup. Check your turbo's data plate and current housing before ordering. Shop by turbo brand and frame to find the right turbine housing for your build.
The turbine housing collects exhaust from the manifold and directs it onto the turbine wheel through a spiral passage called the volute. How tightly that passage narrows, expressed as the A/R ratio, determines how fast exhaust hits the wheel. That's why the turbine housing has such a strong effect on spool, drive pressure, exhaust gas temperature, and how much the turbo can flow at high rpm.
A smaller A/R typically speeds up exhaust flow onto the wheel, so the turbo spools sooner and responds faster. It commonly raises drive pressure and EGT and can limit power at high rpm.
A larger A/R typically lowers drive pressure and supports more top-end flow, but the turbo spools later.
The right A/R depends on engine size, power goal, rpm range, and how the vehicle is used. Towing and daily driving commonly favor response, while high-rpm builds commonly favor flow. Your tuner can help confirm the best choice.
Turbine housing questions usually start with a crack, an exhaust leak, a spool problem, or uncertainty about which A/R to choose. The answers below cover the most common turbine housing problems, such as cracked tongues and wastegate ports, warped flanges, boost creep, and high drive pressure, plus how A/R and scroll design affect performance. Because housings must match your turbo frame, turbine wheel, and manifold flange, confirm compatibility on each product page before you buy. For help choosing a housing for your build, talk with your tuner or contact our team.
Common signs include a ticking or puffing exhaust leak near the turbo, low boost, slow spool, and soot marks around the housing. Cracks commonly form at the tongue or wastegate port.
Typically yes, but it can raise drive pressure and EGT and limit top-end power. Match A/R to your power goals and how you use the vehicle.
A turbine housing A/R that's too small for the power level is a common cause. A larger A/R or a turbo with more turbine flow typically lowers drive pressure.
Divided (twin-scroll) housings keep exhaust pulses separated and commonly improve spool with a matching divided manifold. Undivided housings are simpler and suit single-scroll manifolds.
Yes. On internally wastegated housings, a wastegate port that's too small for the power level can't bypass enough exhaust. Porting or a larger external wastegate commonly helps.
For high EGT, heavy towing, or track use, higher-alloy or stainless housings commonly resist cracking better. For most stock and mild builds, cast iron is typically sufficient.
Yes, if it's free of cracks, erosion, and scoring. Inspect it carefully before reuse.
