IN MY OPINION, NEVER SUPERCHARGE A 4CYL, BUT I'M UP TO REASON ON WHY IT'S GOOD TO DO SO-------THIS WILL SOUND STUPIT! I GUY I KNOW HAS D17 S/C, WHICH I KNO IT'S SOHC, BUT STILL TO SPEND $4500 ON PARTS AND LABOR I'LL WAX HIS ASS