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None. Dump valves are not required (unless you are 18 and wear sports gear in the street and a baseball cap backwards!) A recirc valve offers genuine improvements and helps performance and makes a sound that better suits the car....

Dad x
 

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None. Dump valves are not required (unless you are 18 and wear sports gear in the street and a baseball cap backwards!) A recirc valve offers genuine improvements and helps performance and makes a sound that better suits the car....

Dad x
:eek: s1 still has a Bailey trumpet one lol
 
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