1.5 Inch Velocity Stack for HS4/HIF38/H4/HIF4 Carburettor, Carbon Fibre

1.5 Inch ram pipe to fit the SU HS4 / H4 / HIF4 / HIF38 carburettor. 
 
Designed based on performance specifications outlined in the 'Tuning The A-Series Engine' book.
 
Manufactured in a durable carbon fibre material.