I Need Some Help

:banghead: I'M DEBATING WHAT TO DO WITH MY MAZDA. I HAVE A 4 CYL (HALF A ENGINE) I WANT TO UPGRADE THINGS ON IT BUT I REALLY DON'T KNOW WHAT I SHOULD DO FIRST. SHOULD I GET THE EXHUST THEN GET OTHER THINGS DONE TO THE ENGINE OR SHOULD I GET MY TURBO FIRST THEN EXHUST. PLEASE GIVE ME SOME ADVICE. ZOOM ZOOM:feedback: