Trials GT header should be out in a month or two. DC is suppose to be a 10-14 hp gain & HS is a 10 hp gain. Even if DC's header is only 10hp, it cost less than HS, so it would be the obvious choice to go with. IMO honda parts on a celica
I'm gonna wait to see what Trial's dyno is & how much they're gonna cost. I'm leaning towards Trial, eventhough I haven't seen any dynos, 'cuz it'll be stainless steel.