modifications > do88 Turbo Inlet Hose

Why did I install a do88 Turbo Inlet Hose?

To make a turbocharger more efficient, both the exhaust and intake sides must be free from restriction as must as possible. In the case of factory turbocharger inlet piping, Toyota chose to utilize plastic piping that necked down in some sections that restricted flow. To make matters worse, I will be installing a larger turbocharger in 1Q2026 and will need as little restriction as possible on the intake side.

In steps do88 performance with their turbo inlet hose. This silicone hose replaces the OE turbo inlet elbow and plastic piping along the backside of the engine under the wiper cowl. In my case, I removed a rubber coupling on my back Eventuri pipe and joined it to the do88 turbo inlet hose with a hose clamp.

Date Completed:

12/12/25

Materials:

- Toyota GR Yaris turbo inlet hose (do88performance.com)
- Several sections of shop rubber hose (slit and installed to protect vacuum hoses from sharp edges)
- Black zip tie for Flex Fuel Sensor wiring harness

Tools:

- 1/4" drive ratchet with 2", 6", 12" extensions and sockets (E8, 5mm Torx, 7mm, 10mm)
- Combination wrenches (12mm, 13mm)
- Flat-blade screwdriver
- Side cutters
- Scissors

Notes:

1. Temporarily disconnect mass air sensor wiring plug. I did cut a ziptie and temporarily remove my Flex Fuel Sensor wiring harness under the Eventuri scoop. I put it back later.
2. I already have an Eventuri intake. If you have a stock GRC airbox, the do88 turbo inlet hose will connect to the piping behind the engine under the wiper cowl.
3. Pay close attention to OE vacuum line routing. Don't let them touch hot stuff or sharp things. The do88 turbo inlet removes several spots to attach vacuum lines. Zip tie if needed.
4. Reversible back to stock.

Removal:

1. Remove engine cover.
2. Loosen hose clamp, remove (1) bolt, remove (1) nut, remove (1) stud, and remove OE turbo inlet elbow.
3. Remove OE intake box and piping behind engine under the wiper cowl. Or in my case, remove complete Eventuri intake.
4. Remove (1) bolt from the OE turbo inlet to a bracket near the valve cover breather hose connection.
5. Remove OE turbo inlet piping behind engine under the wiper cowl. No room to remove it from below the engine.

Installation:

1. Install do88 turbo inlet metal adapter on OE turbo compressor housing.
2. Install do88 turbo inlet silicone hose from below the engine.
3. Install lower hose clamp on do88 turbo inlet silicone hose to metal adapter on OE turbo compressor housing.
4. Reinstall OE intake box and piping behind engine under the wiper cowl. Or in my case, reinstall complete Eventuri intake. Connect (1) hose clamp to do88 turbo inlet hose.
5. Verify all OE vacuum lines are routed in a safe manner. Don't let them touch hot stuff or sharp things. I slit sections of rubber hose and put them over the vacuum lines in (2) spots.
6. Connect valve cover breather to larger bung on do88 turbo inlet hose. Connect OE vacuum line to smaller bung on do88 turbo inlet hose.
7. Reinstall engine cover.
8. Make sure the factory mass air meter sensor is plugged back in.