I'm just curious what are the differences between the different brands. I know Dynojet PCIII's are probably the most popular. But, I know that K&N makes them, Yosh has the EMS, and there is the TekaSFI "Magic Box". This winter I will be looking for some more horsepower. :arsenal The easiest way possible. I appreciate your info. By the way, I have a Yosh RS-3 can, I will add a BMC or K&N filter too.