>TAP has the Samco blue silicon hose with dump valve port for the atmos. >dump valve you mentioned. Shef, the cost of the above hose is: $250 the boost bypass valve (the one Audi uses) cost from Bosch is $30 >insert "in" end of blow-off valve into Samco "big blue" port is "big blue" the accordion hose? Avi Meron