my nephew just bought an M reg civic turbo thing, i asked him if he had a dump valve on it and his reply was " no that bit a dump valve goes on to has been welded up" so i thought i'd ask here what was going on
its to get chatter on over run instead.... in the 'street' scene its the 'thing' to do as it sounds 'cooler' to the women as you give it a chchchchch as you go past.