F.I or Berk tbh, both similar sound and gains
You will have to look around and compare prices as everyplace may change without notice, I managed to find mine from VividRacing for little under 500 something like 480-490
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2012 370z 7AT- ES2 with PSS, K&N Drop-ins, LED's all around, Berk HFC, FI CBE non-res, KW V1's
2003 A4 5MT- The Beater
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