The HKS Hi-Power is one of the best flowing and best sounding exhausts for the 300ZX, and is still of very high quality despite the low price. Hi-Power Exhaust systems incorporate a race inspired angle mounted stainless steel muffler and piping design for greater flow and higher-RPM power gains, which provides a less restrictive path for exhaust gasses compared to many exhaust systems, which mimic the stock exhaust with two ~90° bends. The large, angled mufflers compliment cars with a low, wide, aggressive stance. You can expect a 20HP gain on a Twin Turbo, and a 10HP gain on Non-Turbos (Coupe Only). The HKS Hi-Power will NOT fit on a 2+2 model.
- Style: Cat-Back
- Midsection: Resonated H-Pipe
- Piping Size: 65mm
- Muffler Tip: 120mm
- Material: Polished SUS304 Stainless Steel
- Idle Volume: Approximately 70dB interior, 72dB exterior (at side of car), 85dB exterior (at rear of car) -- tested on a TT with 2.5" non-resonated test pipes and 2.5" downpipes
Our new Compatibility checking feature is still being updated and revised. If you have questions about vehicle fitment, please contact us.
What internal diameter is this? 2.5" or 2.25"?
Hi Bogdan, the inner diameter is 62mm
Flowing of air wise/performance, This exhaust system vs megan quad tip?
Hi Said, the HKS is generally considered to be one of the best flowing exhausts available for this car.
Does this install easily as oem or require fabrication/modifications to mount on a ‘90 300 z ?
- Richard deVarga
This is a direct bolt-on, as long as it's a 2-seater.