i am in the process of building two set of twins, one for my truck and one for my dad. Both trucks have the standard B-1 and both can't keep the egt's down. gonna use the b-1 and a ht3b. Guy down the road is gonna help me fab it all, he has tig and bender. We just bombed my intercooler and hoses. uses 150 psi hose, enlarged the coller to 4" and one side of the lines. so its now turbo, 3" to 4" pipe, 4" cooler, 4" cooler, 4" to 3 ", and the air horn. anyway, ... gonna hog out the head first, then have Nowel put in the copper o-rings. Hey Brandon, did u ever get a wastegate on your twins, and how do u like the b-1 twin set-up?