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So far the Ranger intrigues me the most, as that design has been around for some time now, BUT, I recently found out Ford uses a composite (plastic!) intake mainifold on their 4-banger engine (which I was interested in).
The idea of a plastic component directly on an engine doesn't sit well with me. I've poked around and found out there has been some problems indeed associtaed with these composite components. I was also disturbed to hear that GM uses this production as well, and many other companies are looking into that material usage.
I just can't imagine that being a durable part - and I bet it won't last 20+ years like I'm used to!
Jim
You are going to have a hard time finding a vehicle that does not have a composite intake manifold these days. The two V6 engines available in the Ranger also use composite intake manifolds. On 3.0L ones, you may be able to use an aluminum intake manifold from an older 3.0L, but I am not sure if it is a perfect replacement. The 2.3L Duratec has always had a composite intake manifold though, and newer ones have a composite valve cover.
Both the I4 and I5 in the Colorado use composite intake manifolds and composite valve covers.
The Tacoma also uses a composite intake manifold, as well as a composite valve cover on 2.7L engines (not sure about the 4.0L).