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Originally Posted by awawrz
I have AR design hi-flo catted DP on the way. HAve been looking at the full race from Berk. How loud is the axel back compared to stock (have N55 135i)?
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The full race is much louder after 3.5k rpm. But I cannot describe how loud it is. It's definitely a sexy sounding in the market now. I also have ER charge pipe if you are interested.