Exhaust
 

Fujitsubo:
sound lvl
idle: 64db, 6750rpm: 80db
Stainless Steel, 76.3-60.5mm pipe, 90mm tip.
17.8kg

HKS:
sound lvl
idle: 64db, 6750rpm: 81db
Stainless Steel, 65mm pipe, 90mm tip.
20.1kg

GReddy/Trust:
sound lvl
idle: 65db, 6750rpm: 83db
Stainless Steel, 65mm pipe, 100mm tip.
15.9kg

Ganador Vertex:
sound lvl
idle: 68db, 6750rpm: 90db
Titanium, 60mm pipe, 100mm tip.
8.6kg

Auto EXE:
sound lvl
idle: 63db, 6750rpm: 80db
Stainless Steel, 60.5mm pipe, 90mm tip.
18.2kg

Feed Sonic AS:
sound lvl
idle: 65db, 6750rpm: 88db
Stainless Steel, 60mm pipe, 90mm tip.
18.5kg

Pro Staff R Magic:
sound lvl
idle: 67db, 6750rpm: 87db
Stainless Steel, 70mm pipe, 90mm tip.
16.6kg
has been tested at Japan, gain 14.5ps and 1.1kg-m.

JIC Bullet Spartan DE:
sound lvl
idle: 63db, 6750rpm: 84db
Stainless Steel, 60mm pipe, 100mm tip.
17.8kg

Revolution Exhaust system:
sound lvl
idle: 64db, 6750rpm: 86db
Stainless Steel, 70mm pipe, 80mm tip.
16.0kg

Good info. I wish someone would do these tests on the US systems like the B&B, Borla and RX8store.

Also, the Mazdaspeed exhaust...