The HKS Super Turbo Muffler is a JASMA-certified 75mm SUS304 stainless steel 2-piece cat-back (mid silencer and rear silencer) for the Subaru Impreza WRX STI GDB chassis variants E/F/G (EJ207, 2004-2007 four-door sedan), raising close-measurement sound from 84 dB stock to 91 dB with a single 124mm SUS304 tip.
Specifications
| Type | Cat-back exhaust system (Super Turbo Muffler) — 2-piece (mid + rear silencer) |
| Material | SUS304 stainless steel |
| Pipe Diameter | 75mm |
| Tips | Single 124mm — SUS304 stainless steel |
| Sound Level | 91 dB (close, HKS); 84 dB stock |
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