Louder? Greddy SP2 or Borla?
I've heard allot of different setups from dyno days and various Florida G35 club members' cars from Borla to HKS to Greddy EVO & SP2 to Inivida, etc. and the borla is definately deeper than most especially with high flow cats. I'd say the deepest/loudest is either Injen or Invidia/Pro-1.
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