We discovered (with our wideband) a few years back that a stock 2.8 chip will work fine A/F ratio-wise even on an engine equiped with our intake manifold and headers. It was actually spot-on. If you add a wild cam or other mods it may be a different story.
Anyway, the thing to keep in mind wiith ECU chips and stock or modified engines, for the best results you can't simply throw a just any supposedidly SUPPER CHIP at it. You need to get dyno and wideband data FIRST and then burn a chip accordingly.
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trueleo.com RSpiderII@aol.com[This message has been edited by Francis T (edited 09-23-2011).]