This is a Berry Motorsports billet intake for 4V C head intakes. Makes power up to 8500RPM. Could be higher but another turbo 5.4L combo we tested made power up to 8500 which is where we stopped the pull and the graph showed the power still rising. This was going to go on a 4.6L twin turbo but plans have changed. This intake has never been installed on an engine. It does come with fuel rails but a separate adapter for a throttle will have to be purchased. New price is $5200 but this particular intake is going for $3500.