YOU ARE LOOKING AT A 150HP - 350HP NITROUS PLATE. THIS IS FOR THE PLATE ONLY. THIS PLATE FITS ALL SQUARE FLANGE 4150 STYLE HOLLEY CARBS 600CFM - 950CFM. THIS PLATE IS BRAND NEW. IF THIS PLATE LOOKS FAMILIAR, IT SHOULD! WE SELL THOUSANDS OF THEM WORLD WIDE AND HAVE FOR YEARS!!! WE STOCK A COMPLETE LINE OF NITROUS PLATES AND PLATE KITS. WE ACCEPT CREDIT CARD PAYMENTS. FEEL FREE TO CALL US WITH YOUR QUESTIONS AT 281-304-1515.