The intrepid has an interesting intake design. It has the short/long runners too... but its plenums are separated by a valve. The valve is vacuum operated (at least on my wife's 1999 3.2l). The separated plenums are supposed to give more low end torque, but you want them joined for high rpm. I think the short runners open up around 4,000rpm and the plenum valve opens around 5,000-6000rpm.
