hello
just purchased my first impreza (uk turbo(99))
i have always wanted a dump valve, just for the sound when you change gear.
can any one tell me:
what a dump valve does?
is it good or bad for the car??
what is the best one to get and how much would one cost, fitted???
would it affect the insurance????
would it affect the performance?????

thanks

carll..

 

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