I did mine about 6 months ago and that is why I realized they removed the valve after fixing the 50i exhaust tip so better check. The sound is louder because the valve is removed. But I feel the low end torque is effected. Since you guys have been driving without the change why not do the change and let me know whether there is a different. And remember to ensure they sealed the tube which is connected to the valve. I found mine is not sealed and I went back to get it done. Good Luck.
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