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I have the SE stage 1 kit which works great for your low end. On my Heritage I have the heavy breather and that does wonders all around. Make sure to get your sert, and some pipes to get the best results.
What other mods are done to the motor, if any? Swapping out air cleaners on a stock motor won't yield any noticeable improvement. Combine it with pipes, rejet the carb and a cam and you will be haulin'.