headers on the 3v are kinda a waste of $$ unless your f/i or something. the stock headers flow so well that your usually only gonna pick up 10ish whp which is not much for $400+ headers!
just go with o/r mid-pipe,ud pullys, and slicks and youll have a high 12, low 13 all day!
You could always do a turbo like you did, and have a 14.2 second car MOST of the day.