i am considering buying a cold air intake for my 2000 323i. i have read figures like (stock hp + 5-10%) anyone know any figures on hp and torque increases. anyone got any good suggestions on which has more effect: the kind that takes the air filter down behind the front bumper or the kind that has a heat shield and leaves the conical air filter near where it originally was? i have looked at bavarianautosport.com and http://www.benferperformance.com/main.pl?sid=5893016493&page=pitem-bmw&product=BMW-E46-CAI and some others on ebay.com. anyone ever heard of benfer performance?