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I had the E race with stock x pipe and both cats, then installed test pipes, then went catless MS xpipe.
I prefer the xpipe over the test pipes and mainly because there is less drone and it is quieter at cruising speeds but louder when you get on it.
Only thing is it seems like the MS xpipe caused the E race tips to sit a little further in, compared to how it sat prior. Not sure if that's cause of my poor installation. Feels like the tips need to stick out another inch or two. And especially when I decide to get a rear diffuser it'll make it look even worse.
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2008 E92 M3 - AW on Fox Red
2014 MB E63 S
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