my ceffy doses like an athlete on the roids, but it comes from factory with no recirculation valve, and still runs stock boost on a stock turbo. all you have to do is take out the intake resonator and bolt in a pod and I get instant flutters.
GAGF if that's bad for the turbo, it came from factory like it and has run for 180,000 kms with no damage to the turbo or engine.