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As a general rule of thumb. Anything changed behind the MAF should be tuned. So a throttle body or intake manifold etc.., Or, anything that changes the location of the O2 sensor or removes the factory cats. So long tubes or off road pipes will generally need a tune.
So everyone here is pretty much right on. The intake and high flow cats should be fine. You might catch an insufficient catalytic converter code on the cats every now and again but other then an eye sore it's not a big deal. The throttle body change might cause some issues.
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