I suppose you have already tested and discovered the power difference already, however, if you have not based on the comments, the answer is YES! you can draw more power from your hemi through changing out stock ignition coil packs for other ones. The trick is in understanding the coils winding and gauged wire used in the coil. Think about it like you would a persons arteries. When constricted, one can suffer from catastrophic heart failure and death. Although a morbid example, apply it to the flow of volts through the coils. The larger the gauge wire, the lest resistance and greater flow. A test conducted on stock and aftermarket coil pack showed an increase of 11 hp simply from changing to a different coil pack. While you would also need to for a change in spark plug gap (you do not need to change the current stock gap), the fact is you can increase hp by introducing a beefier ignition coil pack. It will most certainly cost you more than stock, but if you care little for the change in price, you will be pleased with the change. The change alters the power band, providing more power at lower RPM ranges; differences you can feel.
