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i have exactly same thing happening right at 2k rpm but it happens only after i installed catless x-pipe. My sound most likely happens because of the leak at X-pipe to muffler connection. The clamps are really tight but i suspect that they have stretched over time due to heat or whatever and are not squeezing pipes properly allowing leak to happen. Does this sound happen every time or under the load? For example, if you were to go downhill say accelerating from traffic light and down hill when car does not require much throttle, does this sound happen as well?
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