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There is no way 20hp is possible with just a chip. I'm not sure there's anything to gain with stock intake/exhaust and chip mod.
I wish someone would get the air/fuel ratio measured for a stock chip. I don't think there's enough room to advance the spark for anything worthwhile. Cars these days are made to run very clean (environmentally speaking). OBDII has made chip tuning much harder for everybody. So unless you're running lean up top, what's there to tweak?
Introduce more air (and consequently exhaust more gas), then I would see a need a chip. And even then, like what Clubhead has experienced, it's not just "plug and play".
So unless you get your car dyno'd and know exactly what the chip is doing to the a/f mixture, you might actually be harming your car (running lean) or killing your cats (running excessively rich).
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