DO88 997.1 Turbo Inlet Plenum - 74MM

To fit: 997.1 Turbo models 2007-2009, using a OEM 74mm throttle body

DO88 are proud to present our newly developed Plenum for the Porsche 997.1 Turbos. 

With this extreme high flow Plenum, the performance of your 997 generation 1 will increase! - The results of the final design were very impressive as the do88 Plenum totally outperformed the Porsche OEM Plenum by 34% increased flow when used in combination with a GT3 82mm throttle body at the same pressure drop!

• Available for OEM (74mm) and GT3 (82mm) throttle body
• do88 plenum is Y-shaped for improved air flow.
• High quality casting pipe with CNC-machined connections
• Smooth internal surface for best air flow
• Comes with all necessary accessories for installation

The OEM 997 Turbo plenum is T-shaped which means the air flow from the throttle body abruptly changes direction as it is divided to each side of the intake manifolds. It makes sense to design a plenum with a Y-shape instead of a “direct stop into the wall” T-shape. During the development process of this plenum we spent a lot of time with flow simulations of the internal Y-shape design. We made both flow simulations on our CAD system and real tests on our own SuperFlow SF-1020 flow bench on 3D-printed models. To be able to manufacture this final design we choose to make a 3D freeform designed casting. This construction adds a lot of performance but not so much of extra weight. We designed the outside of the plenum to add as little weight as possible overall.

1. do88 Performance Plenum weight is 0,80 kg (1,76 lb) OEM plastic pipe weight 0,28 kg (0,62 lb) and a competitor's cast performance pipe weighed 1,19kg (2,63 lb).
2. The DO88 plenum flows 34% better for GT3 throttle body and 18% better for OEM throttle body compared with the OEM plenum (see diagram below).

The do88 Performance Plenum is straight bolt on when used with the 82mm OEM Porsche 997 GT3 throttle body, but you can also purchase this plenum together with a CNC-machined adaptor plate that allows you to install it with the oem 74mm OEM Porsche 997.1 Turbo throttle body.

Be aware of that the OEM parts were only designed for the power level the car was built for originally. A power increase may cause your stock plenum to hold back the power of your engine, so even on an engine with a software tune the do88 performance plenum will give a performance increase!

do88 performance plenum comes as a complete package with all parts necessary for installation.

When you order this kit, there is one choice that must be made:

Throttle body size: for OEM 74mm or GT3 82mm.

Please note, their is not any throttle body included in this kit.