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Originally Posted by rafaele92
After lots of thinking. I took my M5 CP lci for removing resonators. There is NO drone. And car is louder at 2500 3500 rpm. There is no much difference. Only more a little bit. I will make a video soon. 50labor
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I also did this. I can confirm that cp s are res delete from factory. I have my stock " res" cut open in my garage and there is no res. it's a straight pipe that's made to look like the stock w/ res.
So all CPs are res delete from factory.