just to re open this can of worms, i could be hellishly wrong but the cha cha cha is waste-gate chatter inst it? sounds very different to recirculating dump valve?
i have a ibiza cupra before my gti and i had a k and n filter, 007p, turbo intake a k03s and a remap that thing used to make sooo much noise i loved it and i want it back to be honest but dont know which is the best way to go here...
i prefer the chatter but that requires a external wastegate doesnt it? so all im going to get relatively cheaply is dump valve noise coming through the intake and the turbo intake pipe with give me the spooling noise...
iv decided to do a bit of research as today i saw a very crappy looking gti with a very chavy atmospheric dump valve which did nothing but make me cringe :(