In a dyno test Dulcich wrote about, the Performer was stronger on the low end and weaker on the upper end than the OEM intake. As he mentions, a port match may improve it. At the point of the test when the intakes were swapped, the engine still had a stock cam. Yep, the stock intakes are heavy. About 45 lbs i think. A 440 intake is a few pounds lighter. http://www.moparmusclemagazine.com/techarticles/mopp_0105_dyno_test_360_smog_motor/viewall.html