Review these closely as to stock, using different airfilters, and tuning.

Here is at the Drags last month using powerloader junk PCM code, and MAFT and then after I sh&t canned the powerloader and did my own PCM calibrations.



A '01 Z06 after switching to a Donaldson airfilter. With stock filter LTFT was 3% lean and after LTFT goes to 8% lean, thus needs larger injectors.



A '02 Z06 stock and way too lean !



a 02 Z06 using a dual K&N filters, and then better when stock filter was used. Looks like a bad design on dual K&Ns.