H1 HAS TRADITIONAL SIDE ENTRANCE CAP - STREET & LIGHT RACING -------------------------------------------------------------------------------------------------------------------------- H2 HAS WIRES GOING IN TOP - BUT HAS RARE EARTH MAGNETS & INTERNAL COIL -------------------------------------------------------------------------------------------------------------------------------------------- H3 IS A H2 EXCEPT WITH EXTERNAL TRANSFORMER & INTERNAL COIL - MAX AMPS FOR BLOWN ALKY OR INJECTED NITRO OUR STRONGEST ----------------------------------------------------------------------------------------------------------------------------------------