1st things first, you only need one header for an inline four cylinder. just buy CARB approved products, and you should be okay (somebody plz correct me if i'm wrong). as far as the tq converter goes, i really don't know what to tell you except one of few options is a company called level ten.deplitch said:When you put hearders and exhaust on your car, will it make it non-smogable? Also,how much does a tourque(don't think I spelt it right) converter cost and how difficult is it to put in?