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Guarva, if you will just measure the pipe coming out of the rear of the resonator, that will tell you what size you can use easily. You can get to the pipe by laying down beside the X5 (without getting under it), as the exhaust runs close to the passenger frame rail. You can use a flexible vinyl measuring tape to get the size in mm's or inches, or you can cut a strip of paper about 1/2 wide and 8" long and wrap it around the pipe. Mark where the paper reaches itself around the pipe, then just go measure that piece of paper. Once you have the circumference measurement you can easily find the diameter of the pipe.
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