It sounds like he is talking about LM1s...to answer your question, no, that is actually probably the most raw and nasty sounding setup conceivable. Like the others said though the II's sound a lot better and much much "cleaner".
Its probably gonna sound the exact opposite of clean...If u want something clean sounding, u need to run cats. Plus SLP's are one of the nastiest sounding mufflers on the market.