Description quickfuel new all aluminium hr-450 Superchager carburettors  Designed for the customer who is running 2 x 4 set up and needs a 450 CFM double pumper carburettors Features: Blower referenced Modified pumps and main circuits for supercharged applications mechanical secondaries  dual feed fuel inlet Calibrated for excellent street/strip performance 1 boost reference port, 1 full vacuum, and 1 PCV port Performance upgrade mildly modified to highly modified vehicles Universal calibration for easy bolt-on performance Adjustable float level Sold as a pair *Set up to sit side ways as shown in photo.  will not fit inline