Their test engine would have had, at the bare minimum, a front mounted intercooler, as would be required with the throttle body placement. In testing, Plazmaman saw gains as high as 19HP at the wheels on standard boost pressure (possibly slightly increased due to easier breathing). Scroll to the bottom of this article to read a more clear list of the pros and cons of the stock RB20 intake manifold. The unit itself is cast aluminum, with a rough (some would say ugly) texture, that was designed for functionally before all else. And that right there is why the OEM intake manifold setup ruffles so many feathers. The OEM plenum design offers mostly equal distribution of air to each of the engine's six cylinders and was designed with that (as well as production costs) in mind. When switching to a shorter intake manifold runner setup, you may well notice a decrease in low and mid rpm performance. Something Nissan felt the RB20 needed plenty of, due to the more high-rpm-oriented design of the engine. As was mentioned earlier, longer runners typically translate to improved low to mid-range power production. The lower portion consists of the intake runners, which are nice and long. The OEM design is two pieces, with an upper (the one you can see) and a lower portion. The OEM RB20 intake manifold setup does offer some benefits. Higher intake temperatures can lead to increased likelihood of engine destroying detonation. With increased heat soak comes increased intake temperatures. Despite the adequate performance, the OEM setup suffers from heat soak, as does the factory crossover pipe and side mount intercooler piping. At stock and increased power levels, the OEM setup is fine, if a bit unattractive. There is nothing inherently wrong with the OEM intake manifold design, with the exception of the relatively convoluted intake piping setup that it creates. Below is a stand RB20 intake manifold and piping arrangement. At the end of the day, most people switch not for the (potential) significant performance benefit, but rather for the cleaner look and reduced intake piping heat soak. Likewise, if you're all about top end monstrous power, you will probably be happier with a shorter runner design. If you're interested in making as much mid-range power as possible, you're going to want longer intake runners. The end result is that size, shape, and capacity all have dramatic effects on how your RB20 will behave. There are numerous designs that have been tested, redesigned, and tested again. So, what does any of that have to do with RB20 intake manifolds, you ask?
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