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Performance Modifications

Vehicle Information: Year: 1985; Engine (size, modifications): 5.0 DOHC 32 valve; Total Mileage: 120000; Transmission type: Autotomatic;

I have a 1985 Porsche 928S and am wandering if I would be able to use and intake manifold off a newer model like an 87 or so on my 85 if it would bolt up. I also have a knocking sound at idle in the engine bay sounds like it coming from the front of the engine but cant really tell only does it at idle. Do you know of any performance aftermarket intake manifolds and cold air kits out there?

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