No doubt, but if the exhaust isn't what's holding the power back, making it more free flowing will sometimes result in a drop in backpressure which can reduce low end torque.
I have exhaust mods on my car, the H pipe and the exhaust, it's cutting backpressure, but the stock parts hurt power above 4000rpm. My car pulls WAY better up top than it did with the crap exhaust on it.
