As far as material quality, fit and finish, FI, Ark and HKS are all on par, all look very similar from the rear, and all sound great. You can't go wrong with any of them.
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She's For Sale! PERFORMANCE: Aero Workz | Akebono | BC Racing | EcuTek | HKS | MaxBore | Motordyne | Nismo | RJM | SPL | StopTech | Z1
AUDIO: Arc Audio | Bazooka | Helix | Pioneer | Stereo Integrity
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