[Tommy]

Earlier on, someone suggested you let him run potential HP/torque numbers through his dyno software. If you're going to do this thing piecemeal rather than as a complete package, that is the best way to go IMHO. That will come closer to telling you how one specific change is likely to change your existing engine than any number of salesmen or on-line advice givers such as me. Dyno software is not perfect, but it's far better than some saleman's WAG intended to help sell his product.