All this talk of leaning out at the upper ranges confuses me. I have a Zeitronix and DashDAQ and try to log every run. I'm not seeing any leaning out on my runs. Yet, I can't get a better time than a 12.5.

I've got a single NW CAI, NW Manis, NW SuperCooler, Code3 Pulley, Mickey Thompson ET Streets and LET Tune (which has been retuned from my datalogs). Other than the NW dual intake, I think I have every part Rob sells. Sure, the 178 pulley performs marginally better than the Code3, but that doesn't explain the difference between a 11.99 and a 12.5.

I'm starting to think that part of my problem is the original plugs. I'm planning to put colder plugs in and see what that gets me. But again colder plugs help prevent detonation, which is usually a result of leaning, which I'm not seeing. So I doubt they'll help, but they sure can't hurt.