{"product_id":"garrett-g38-gxr38-turbine-housing-t4-v-band-1-06-ar-grt757707-0044","title":"Garrett G38\/GXR38 Turbine Housing Kit Div T4 \/ V-Band 1.06 A\/R","description":"\u003ch4\u003eHigh-Flow T4 Divided Turbine Housing for Peak Power G38 Builds\u003c\/h4\u003e\u003cp\u003eThe Garrett G38\/GXR38 Turbine Housing Kit T4 Divided \/ V-Band 1.06 A\/R (GRT757707-0044) is the largest A\/R option in the T4 divided G38 housing family, optimized for maximum exhaust flow at high RPM in large-displacement or high-power builds targeting the upper capability of the G38-1000 or GXR38-64 supercore. The 1.06 A\/R ratio on GRT757707-0044 reduces back pressure at peak RPM, allowing the compressor to reach its maximum efficiency zone on engines generating the most exhaust enthalpy. This housing is best paired with larger displacement engines above 4.0L or builds where maximum peak power above 800 horsepower is the primary objective, with some trade-off in lower-RPM spool response compared to smaller A\/R options.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eGRT757707-0044 T4 divided \/ V-Band turbine housing for G38-1000 and GXR38-64 supercores\u003c\/li\u003e\n\u003cli\u003e1.06 A\/R provides maximum exhaust flow capability at peak RPM for high-horsepower race builds\u003c\/li\u003e\n\u003cli\u003eT4 divided twin-scroll inlet for manifold pulse energy retention and improved response\u003c\/li\u003e\n\u003cli\u003eV-Band turbine outlet for clean downpipe interface in custom fabricated exhaust systems\u003c\/li\u003e\n\u003cli\u003eStainless steel construction for extreme heat durability in sustained high-boost operation\u003c\/li\u003e\n\u003cli\u003eExternal wastegate only for full boost control capability\u003c\/li\u003e\n\u003cli\u003eIncludes gasket kit, V-Band clamp, and mounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eGRT757707-0044 \/ 757707-0044\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Supercores\u003c\/td\u003e\n\u003ctd\u003eG38-1000 (938272-5003S), GXR38-64 (934173-5008S, 934173-5009S)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTurbine Inlet\u003c\/td\u003e\n\u003ctd\u003eT4 Divided (twin-scroll)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTurbine Outlet\u003c\/td\u003e\n\u003ctd\u003eV-Band\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eA\/R Ratio\u003c\/td\u003e\n\u003ctd\u003e1.06\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWastegate Type\u003c\/td\u003e\n\u003ctd\u003eExternal only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eStainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eVerify with Garrett distributor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eWhat’s Included\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e1 x GRT757707-0044 G38\/GXR38 Turbine Housing Kit\u003c\/li\u003e\n\u003cli\u003eGasket kit\u003c\/li\u003e\n\u003cli\u003eV-Band clamp for turbine outlet\u003c\/li\u003e\n\u003cli\u003eMounting hardware\u003c\/li\u003e\n\u003cli\u003eNote: Supercore sold separately\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eAbout Garrett Motion\u003c\/h4\u003e\u003cp\u003eGarrett Motion engineers turbine housing kits across a spectrum of A\/R ratios to enable tuners and builders to precisely optimize turbocharger response and peak flow for their specific application. GRT757707-0044 is the highest-flow option in the T4 divided G38 housing family and is ideal for purpose-built competition engines.\u003c\/p\u003e\u003ch4\u003eFAQ\u003c\/h4\u003e\u003cstrong\u003eWhat is the GRT757707-0044?\u003c\/strong\u003e\u003cp\u003eThe GRT757707-0044 is a Garrett G38\/GXR38 turbine housing with T4 divided inlet, V-Band outlet, and 1.06 A\/R ratio. It is the highest-flow T4 divided G38 housing and is optimized for large-displacement or high-peak-power builds where reducing back pressure at maximum RPM is the priority.\u003c\/p\u003e\u003cstrong\u003eWhat engine displacement suits GRT757707-0044 best?\u003c\/strong\u003e\u003cp\u003eThe 1.06 A\/R housing is best matched to engine displacements of 4.0L and above, or to smaller engines built specifically for maximum peak power output above 800 horsepower where spool response is less critical than top-end exhaust flow.\u003c\/p\u003e\u003cstrong\u003eHow does 1.06 A\/R compare to 0.85 and 0.95 for the G38?\u003c\/strong\u003e\u003cp\u003eThe 1.06 A\/R GRT757707-0044 flows the most exhaust gas at peak RPM with the slowest spool, making it suited for dedicated race engines. The 0.95 A\/R GRT757707-0043 is more versatile. The 0.85 A\/R GRT757707-0042 provides the quickest response for smaller builds.\u003c\/p\u003e\u003cstrong\u003eDoes this housing work with an internal wastegate?\u003c\/strong\u003e\u003cp\u003eNo. All G38 turbine housing kits are externally wastegated only. A compatible external wastegate must be purchased and installed separately.\u003c\/p\u003e\u003cstrong\u003eIs weld flange for the downpipe included?\u003c\/strong\u003e\u003cp\u003eNo. The V-Band downpipe connection requires a V-Band weld flange on the downpipe, which is not included. The kit includes the V-Band clamp only.\u003c\/p\u003e\u003cstrong\u003eWhat supercores fit GRT757707-0044?\u003c\/strong\u003e\u003cp\u003eGRT757707-0044 fits the G38-1000 supercore (938272-5003S) and the G-XRace GXR38-64 supercores (934173-5008S and 934173-5009S). It is not compatible with G40, G42, or other Garrett frames.\u003c\/p\u003e\u003cstrong\u003eIs GRT757707-0044 standard or reverse rotation?\u003c\/strong\u003e\u003cp\u003eStandard rotation. A separate reverse-rotation housing part number is available for reverse-rotation supercore applications.\u003c\/p\u003e\u003cstrong\u003eWhat does divided T4 mean for the inlet?\u003c\/strong\u003e\u003cp\u003eA divided T4 inlet has an internal divider that separates the two scroll entries, preserving the pulse energy separation from the exhaust manifold. This improves spool response especially at low to mid RPM compared to an undivided open T4 inlet.\u003c\/p\u003e\u003ch4\u003eInstallation Overview\u003c\/h4\u003e\u003col\u003e\n\u003cli\u003eConfirm your exhaust manifold has a divided T4 outlet flange matching the GRT757707-0044 inlet configuration\u003c\/li\u003e\n\u003cli\u003ePrepare the G38 supercore with oil feed\/return and coolant fittings before mounting the housing\u003c\/li\u003e\n\u003cli\u003eAlign and bolt the T4 divided inlet to the exhaust manifold flange using the supplied hardware, torquing to spec\u003c\/li\u003e\n\u003cli\u003eConnect the V-Band turbine outlet to the downpipe using the included V-Band clamp\u003c\/li\u003e\n\u003cli\u003eInstall external wastegate to the manifold or housing dump port\u003c\/li\u003e\n\u003cli\u003ePrime oil system before first start and complete coolant system bleed\u003c\/li\u003e\n\u003cli\u003ePerform initial idle break-in before driving under full boost load\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Garrett","offers":[{"title":"Default Title","offer_id":46152048050255,"sku":"GRT757707-0044","price":899.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/35726003273807_1.webp?v=1784815763","url":"https:\/\/www.blackopsautoworks.com\/products\/garrett-g38-gxr38-turbine-housing-t4-v-band-1-06-ar-grt757707-0044","provider":"Black Ops Auto Works","version":"1.0","type":"link"}