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Tube connects to the brake booster vacuum line.
Yep. The 997 uses a mechanical vacuum pump which is driven off the bank 2 exhaust cam to supply vacuum to the brake booster. On a 997, that hard line comes off the pump and goes to booster. Good luck with your swap. Edited by PTEC
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I'm interested in hearing about your conversion. What ECU are you using? What wiring harness?

The DME is 7.8 from 2004 996. The middle chassis wiring harness is from a 2003 coupe, I have a cabrio, so I took the convertible part of the old harness and added it to the new harness. Changing the harness was quite a challenge.

The DME needed matching immobilizer and keys.

The fuel system is different, I installed a universal fuel pressure regulator. The new system is returnless, so I just plugged the return line. The egas pedal has been installed as well, no big issues.

Still to be resolved: the power steering pump connectors are different. Installing later type instrument cluster and change some wiring on it.

The engine came with 997 flywheel and clutch. I installed them to the 996 gearbox, but the engine does not turn around! So I will have to change to a 996 clutch.

Looks like it´s the clutch plate which is different...

The engine fires

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