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Re: "Chipping" your car?
I suspect that Jacobs is a lot marketing, and some small improvement as well,
in vehicles with marginal ignition systems, or old plugs.
I think you will get much more performance/$$$ with a (good) chip, and/or
other mods to improve overall volumetric efficiency, K&D air filter, low
restriction exhaust, etc.
Please do let us know what you think of the Jacobs. Be sure to establish
baselines for MPG, 1/4 mile times, 30-60, 60-90 acceleration etc, before
you install the Jacobs. Try to get at least 5-10 tanks of gas over the
course of 1-2 months for the MPG baseline.