I made a Guajillo Chipotle Smoked Porter recently that was pretty good. I found a recommendation on this forum somewhere and used the last 3 days during fermentation in the primary. I think it was pretty good! I used 2 Chipotle dried peppers and 1 Guajillo dried pepper. It came out a little hotter than I thought at first but quickly calmed down and was more smokey than anything after a week or two.