What air filter is the best? Will more dirt be let in?
There are many concerns about aftermarket performance filters working, and which yields the biggest horsepower. Some people swear by foam intakes (while dissenters say yes they yield more power, but let a lot of dirt in) Others are simply satisified by K&N or S&B filters. An oiled cotton filter. The idea being the porous cotton allows the air in, the oil traps the dirt. The K&N uses electrostatic charge to attract and capture dirt and dust. The oil is positively) charged, and therefore attracts dust and dirt, which carries a (negative) charge. Bottom line, a performance filter is better than the restrictive air box found on stock cars. IMHO, if tuner cars (Saleen, etc) come from the dealerships with exposed K&N filters, that means something about it’s performance and filtering effect.
