Avo Stage 4 Turbo Kit - Avo GT3055 Billet Ball Bearing Turbo - GT86 & BRZAvo Turbo Kit Stage 4 Avo GT3055 Billet Ball Bearing Turbo kit for GT86 & BRZ Avo Stage 4 Ball Bearing Turbocharger kit uses a Avo GT3055 Billet Ball Bearing Turbo and custom ceramic coated compressor cover. Exhaust housing is also ceramic coated & 0. 86AR to reduce back pressure. The turbo comes with a 14 psi actuator for precise boost control. Turbo Specifications: Avo GT3055 with 0. 86AR exhaust housing Wheel sizes are very similar to a Garrett