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I'm on Stg 1 as well, car is mechanically stock. I've had the current file installed for awhile (don't know how long but I can figure out from my purchase date) and I'm sure it's longer than a couple hundred miles. I do 350 miles a week if I drive in every day. I probably have several thousand since I went to Stg 1.
I've left it on there because I haven't heard anyone say for sure that this is bad, but the noise is sort of scary as it is definitely somewhere between exhaust rasp/metallic.
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