PPE Diesel 516210040 Turbo Exhaust Ring 4.0 Inch For Garrett Gt42/45/5 And Gt4094 TurbosDescription PPE Diesel 516210040 Turbo Exhaust Ring 4. 0 Inch For Garrett Gt42 45 5 And Gt4094 Turbos Turbine Discharge Flanges Garrett Turbo 4 Inch 45 series from PPE. Adapt to standard exhaust tubing size. Makes your custom exhaust more reliable. Features: 4 Inch 45 Series Makes your custom exhaust more reliable Exhaust rings for Garrett GT42 45 55 and GT4094 Adapt to standard exhaust tubing size Available Sizes: 3. 0 Inch 40 series (516210030) 3. 5