I've read alot of bad things about running meth if you don't have almost perfect distribution across all the intake runners...don't know this from experience though. As for the wideband, I've got a LM-2 Innovate and I love it. It kept me from pulling my hair out trying to get a good safe tune. I run 93 pump (E10) on the street and 100LL avgas when I want to set it on kill. I've been as high as 18lbs with cast pistons and avgas, would have never felt safe doing it without a wideband