The HKS Silent Hi-Power is a 75mm SUS304 stainless steel cat-back exhaust for the Nissan Silvia S15 (SR20DET turbo, 1999-2002); the internal TYPE-S silent chamber keeps close-measurement sound at 93 dB and the system exits through a single 120mm SUS304 tip with 90mm road clearance.
Specifications
| Type | Cat-back exhaust system (Silent Hi-Power) |
| Material | SUS304 stainless steel |
| Pipe Diameter | 75mm |
| Tips | Single 120mm — SUS304 stainless steel |
| Sound Level | 93 dB (close, HKS); 89 dB stock |
| Road Clearance | 90mm (stock suspension) |
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