Center Pipe HKS 33004-AF002 Subaru Impreza GRF/GRB/GH8 EJ25 07/06-10/03 - Center Pipe
It's more big in pipe diameter which let the exhaust gas smoothly to the muffler and have better engine performance.
We used SUS304 that has durability and great appearance.
GRF: Close noise level Stock:L84 R83 LEGAMAX Premium installed:L89 R88
GRB: Close noise level 84dB (LEGAMAX Premium installed),
[specC] is ok Close noise level 89dB (LEGAMAX Premium installed)
GH8: Close noise level 85dB (LEGAMAX Premium installed)
Pipe size: 65mm