The best BorgWarner turbo for a custom, fabrication-based build in this collection is the BorgWarner EFR-7064 Turbo Charger 0.92A/R WG T4 Twin Scroll - Universal: a universal-fitment EFR turbocharger with a T4 twin-scroll turbine inlet and an internal wastegate, listed with a 0.92 A/R turbine housing. It is a starting point for a planned build, not a bolt-on replacement, so match the turbo to the manifold, engine, and power goal first.
A turbocharger uses exhaust energy to spin a turbine wheel connected to a compressor wheel, forcing more air into the engine so it can burn more fuel and make more power. Sizing is a balance: too small runs out of flow at high rpm, too large responds slowly. Details such as the turbine inlet flange (T4 here), twin-scroll housing, A/R ratio, and wastegate type decide what manifold and exhaust parts the turbo can work with, and are the first things to confirm on any universal turbo.
Because this EFR is universal, supporting parts decide whether the project succeeds: a compatible twin-scroll manifold, oil and coolant lines, intercooler piping, fueling, and engine management must be planned together. Start with the wider turbo shelf, including Performance Intercoolers for the charge-air side of the build.
Brands to know
BorgWarner is a major global turbocharger manufacturer whose turbos are used as original equipment on production vehicles as well as in the aftermarket, and the EFR series is its performance-focused line for enthusiast builds. The EFR-7064 here follows that formula: a performance turbo in a universal configuration, with an internal wastegate, so builders spec the surrounding hardware themselves.
Garrett is the other household name in performance turbochargers, with a deep catalog of universal and bolt-on turbos that builders cross-shop against BorgWarner on almost every custom project. Comparing sizing and housing options between the two brands is a normal part of planning a build.
Forced Performance is known for bolt-on turbo upgrades for Subaru and Mitsubishi platforms, built around factory-style fitment rather than universal fabrication. If you would rather keep a stock-location layout than build around a T4 flange, its catalog is the alternative worth comparing.
Turbosmart covers the boost-control side of a turbo build, with wastegates, blow-off valves, and boost controllers that pair with a turbo like the EFR, while Blouch Performance Turbo offers another bolt-on Subaru-focused option. For planning, read our guide to turbocharger upgrades for the WRX.
FAQ
Is the EFR-7064 a bolt-on for my car?
No. It is listed as universal with a T4 twin-scroll inlet, so it needs a compatible manifold and supporting fabrication. Check your year and model and plan the full setup before ordering, or choose a platform-specific bolt-on turbo instead.
Does a bigger turbo require a tune?
Yes. Any turbo change alters airflow enough that the car needs a professional calibration and matching fueling support. Do not drive it hard on a stock calibration.
What does the 0.92 A/R and twin-scroll wording mean?
A/R describes turbine housing size, affecting response and top-end flow. Twin-scroll keeps exhaust pulses separated in two scrolls, and requires a matching twin-scroll manifold.
What else should I budget for?
Plan on a manifold, downpipe work, lines, intercooler piping, fuel upgrades, and tuning at minimum. The supporting parts are usually the larger half of the project.
BorgWarner$2,26213Pay over time · Est. $70.69/payment