Garrett GT4088 Journal Bearing. Compressor housing is slip on 4" inlet with anti-surge ported shroud and compressor outlet is 2.5" slip-on. ATP Special Exhaust housing with divided 1.06 T04 Flange with standard 3" V-Band machined into it for easy downpipe compatibility and plug and play replacement for older large frame T-series turbos. Largest trim available in GT40 family capable of making a healthy 700+ HP setup. Turbine -Wheel: 77mm 84 trim -Maps: Not Available Compressor -Wheel: 88mm 54 trim -Maps: Not Available