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can anyone explain what sort of intake manifold this is, and is there a power increase or something, compared to the stock plastic one (seems to have more air volume)
That looks like an X51 engine. On the 996 3.6l it's worth another 20hp, but the torque curve is similar to the GT3 engine.
Heads and intake are off the GT3. Intakes are magnesium s opposed to composite.
Here's a picture of mine before going into my car.
I have a rebuildable 3.8 engine with 60,000 klms from 2006 Carrera if any one Is the interested.
Removed because of over rev. was running when removed with good oil pressure and temp.
No over heating. It Is complete with flywheel and clutch.
I have a low quality bore scope and does not appear to have scored cylinders.
Suspect bent Valves. I have only looked at a couple of cylinders as camera quit.
Have a new bore scope coming and will look at rest of cylinders.
If interested PM me.
Located London Ont.