Which one would you choose and why?

 

Forge. Better made and Bailey have a plastic piston which scores and ends up sticking etc.

 

for a dump valve or something else?

 

Changed my Bailey dump valve for an HKS BOV.At around £250 its not cheap,but is worth it just for the sound.Neil at Scoobyworld told me how HKS Blow off valves work,but this is just a quick reply,so i have'nt got my thinking cap on.

 

Forge every time, much better than Bailey

 

got a forge one myself,was fitted on the car when i got it......also i'm glad its a forge because from what i keep reading loads of peeps say its one of the best ones for a scooby