everyone has their own taste on blower it just depends on where you want your power. The KB blowers make full boost right off idle and are awesome off the line, compared to a centi blower that makes boost with rpm. I personlay want a KB but due to the high cost I'm going with a ATI Procharger with the 3 core intercooler. Also the centi blowers make a little more power that the KB ones.........unless your talking about a BIG KB blower like a 2.2 or something like that
any blower is better than N/A . a 4.6 really needs a power adder to shine , so any will do, but for absolute best numbers, the procharger is king. saying that, a vortech is probably the most widely used on the street.