Beats me.
This is a really nice pipe with beautiful welds and excellent fitment -- just made an annoying hiss when paired to my catless S-tune CBE, which is the only reason why I'm selling it.
With cats or a different exhaust, it may sound fine. No one else seemed to find it objectionable except for me, and lots of people own one.
There's absolutely nothing wrong with it -- just not a good sounding combo (at least to my ears) with the S-tune exhaust.
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Enjoy it. Destroy it.
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