Surprise! The oldest design produced the best average power of the dual-planes-of course we're only talking 1-3 numbers better, and that can be testing variance, but still, this thing wasn't at all bad. It's the first of the Mopar aftermarket dual-planes but has not been sold in many years. The DP4B designation means Dodge-Plymouth 4-Barrel, and the C4B (Chrysler 4-Barrel) is for 440s. This intake is most like the stock design, with the smaller of the two planes on the right side and feeding cylinders 2, 3, 5, and 8. The coil bracket is not in the stock location, but even so, many people who want an OE look use this manifold.
Price: Ours was $104.39 on eBay, but maybe the price will jump now.
Manifold height: front 311/44, rear 411/48
Peak torque: 456 lb-ft @ 3,800
Peak horsepower: 445 hp @ 5,900
Power at 3,000 rpm: 419 lb-ft, 239 hp
Power at 5,000 rpm: 431 lb-ft, 410 hp
Average 2,500-4,500: 429 lb-ft, 289 hp
Average 4,500-6,000: 419 lb-ft, 417 hp
Average 2,500-6,000: 424 lb-ft, 344 hp
Read more: http://www.hotrod.com/techarticles/...e_manifold_comparo/viewall.html#ixzz2QD2PpBZY