My DB GMG came with the one piece heat shield. My DB was manufactured in 2015 and I got it as a gift right around Christmas time. I have tried over and over to get steady temps from left to right. My heat shield never came with the slot so I modified it to make one. Still though I could never balance it out. I called GMG and they sent me a new one. I was amazed at the difference in the hole patterns from the old vs new one as in the picture. I installed it to what I thought was the right position and nailed it off the bat!! Temps from left to right at 170 even, when I went to 190 and both sides even, 210 and even, 240 and even. Pretty impressed as I was even thinking of drilling holes in the heat shield, but the new style has worked great so far. Kudos to GMG!!
