I've run 325 in the bypassed #2, but no higher. I've actually only done that once, in the quest for crispy chicken skin (fail), so now I just stick to low and slow - max 250. The main reason I like the bypassed setup, with the Auber, is that it puts the Auber in complete control. I believe cutting out the "middle man" stock controller increases efficiency and accuracy. If you're not going through it, it can't create any problems!