Set of all 4x types of velocity stack that we offer for the SU HS4 / H4 / HIF4 / HIF38 carburettor. 
 
A full set for those who wish to try the different sizes/designs to find what best suits their carb and engine. 
 
Designed based on performance specifications outlined in the 'Tuning The A-Series Engine' book.
 
Manufactured in durable Carbon Fibre material. 
 
This set includes:
HMW Super Stack
2 Inch Velocity Stack
1.5 Inch Velocity Stack
Stub Stack