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In my experience on a NA engine when you typically gain on the top end you sacrafice on the low end and vice versa. This isn't iron clad of course there are exceptions. I thought this might be one when I looked at the dyno on perrins website. It showed no loss of torque at low rpm, but to me the loss is evident.
As far as how you loose low end power, if you just bolt on a more free flowing exhaust you will gain top end, but the reduction in back pressure will typically loose you low end torque. A tune would most like help with reducing the loss I imagine.
HP is meaningless for the most part. For a street car it's all about torque.
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