During this DIY, I am replacing my existing Dinan Throttle Valve Body with another one. Although this baseline install starts with an existing GruppeM intake, I will include BMW's photos of the OEM filter housing as well.
The instructions to change out the OEM throttle valve body assembly are the same.
Time required: Approx. 40 minutes.
Tools needed:
Stubby slotted screwdriver
Small slotted screwdriver
Larger slotted screwdriver
Torx screwdriver (not shown) - for OEM filter housing
Phillips screwdriver - for GruppeM intake
10mm socket and 3/8-inch drive ratchet
Dinan throttle body is in the ziplock bag
Removing OEM filter housing:
Unlock plug (1) and remove. Release clamp and detach air intake hose (2).
Unlock air intake hose (1) sideways and detach. Release bolts. Remove intake filter housing (2) towards top.
Removing Gruppe M Intake:
Locate the phillips screwhead bolt near the driver's side strut tower and remove it.
Unplug and remove the connector to the air mass flow sensor.
Disconnect (retract) the air inlet hose from the CF housing.
This is what the GruppeM intake looks like removed from the car.
The engine compartment with the intake removed.
Loosen this clamp using a slotted screwdriver.
Air intake tube with silencer.
Back to the engine compartment, look at the remaining intake tube elbow that attaches to the throttle body. Remove the tiny air hose shown in the following diagram (red arrow). Pull this hose in the direction of the yellow arrow.
Loosen clamp that attaches the intake pipe elbow to the throttle valve body.
Remove the elbow.
Now you can see the throttle valve body.
Remove this connector. This is what conveys the electric signal to open the throttle valve.
Remove the 4 bolts shown here from the throttle body assembly (2). The plug that you should remove is shown in (1). Remove throttle assembly.
When reinstalling the throttle assembly (2), make sure to replace the sealing ring (1). The Dinan unit comes with a new sealing ring.
To reinstall, do the above in reverse.