Got the new manifold on the truck today. I gained in the 1400 to 1700 rpm range. Lots better spool up. I got just what I was after just like the dyno graphs showed I would get. I'll know how it does under a heavy load in about a month and 1/2 when I go get hay again. I did notice something else nobody has mentioned. I had to move my exhaust back forward 1/4 in. like it was before I put on the my 62/71/13ss turbo. I have a lot more room at the firewall/ auto tranny dipstick area. That was a good surprise.