I was in the same position as you. I ended up going with the vanguard just because i disnt like how the PE looked. The vanguard on the n55 sounds very nice and is decently priced. Sounds good the way it is and if its not loud enough for you just slap a DP on it.
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2016 GTR | 2015 X5 | 2002 M3 | 2015 Mustang GT