The only time i had a noisey solenoid valve is the way the siren was fitted on my newage Jdm Sti the bottom bolt had been removed and the bracket bent for the siren to go on .I ended up going back to were i bought the car and got fobbed of so the next day at home looked under the bonnet a bit more my self and noticed the said valve was touching the body so moved it away took the car for a run no more noisey .Phoned the garage up and complained i was after a new solenoid braket did not get any were with them so took the bracket off straightened so all three bolt holes are used and refitted the siren a different way to the bracket then bought a bolt from subaru dealer job's perfect