CA18D ENGINES

 My fiance and I both own 1988 Pulsars,I would like to put some hot cams and a header on mine but cant find any parts out there.Does any1 know where I could find some high performance goodies for my 1800 twin cam.Will exhaust parts for the GTiR which ran a 2.0 liter fit????Im a Nissan newbie but Im sure my 16 valve twin cam can do better than 98 horsepower