Most guys I see that have problems are caused by not baffling it correctly, and having the idle too low, these bigger motors tend to quit if you pull the throttle off too fast. I use a 2-speed idle setting using the throttle cut switch, when I get over the end of the R/W I hit the switch. And if the cans are mounted correctly so they don't flop around, you won't have header issues, although the flex headers are better than the solid ones. I will have a 157 here in a couple weeks, can't wait!!!
Tom