I have K04's, full stage 3+. Want to keep it a sleeper, so I am about to do my exhaust. I have piggies and no main cats. Between 2 1/4" and 2 1/2", what would realistically be the power difference? If 10hp or les, I would stick with 2 1/4" to keep as quiet as can be. If more than 10hp I would consider bigger. Assuming all other variables the same, same style and length Magnaflows. What would the difference be power wise?

Thanks guys,,,