Смотрим сюда, интересная инфа по dB и приросту мощности
http://www.turbomagazine.com/tech/0212tur_subaru_wrx_exhaust_dyno_results/index.html
Manufacturer Factory Subaru
Type Stock
Sound Decibel @ Idle 87dB
Sound Decibel @ 3000 rpm 86dB
Manufacturer 5Zigen
Type Fireball
Sound Decibel @ Idle 98 dB
Sound Decibel @ 3000 rpm 105 dB
Peak Horsepower 198.7 Hp @ 5625 rpm
Peak Torque 201.3 Tq @ 4400 rpm
Manufacturer Tanabe
Type Racing Super Medalion
Sound Decibel @ Idle 101 dB
Sound Decibel @ 3000 rpm 107 dB
Peak Horsepower 197.7 Hp @ 5600 rpm
Peak Torque 199.6 @ 3600 rpm
Largest Horsepower gain over stock 8.7 Hp @ 4200 rpm
Manufacturer Blitz
Type Nur-Spec Racing
Sound Decibel @ Idle 104 dB
Sound Decibel @ 3000 rpm 103 dB
Peak Horsepower 200.2 Hp @ 5600 rpm
Peak Torque 204.2 @ 3725 rpm
Largest Horsepower gain over stock 13.9 Hp @ 4400 rpm
Manufacturer GReddy
Type Evolution
Sound Decibel @ Idle 94 dB
Sound Decibel @ 3000 rpm 92 dB
Peak Horsepower 200.9 Hp @ 5600 rpm
Peak Torque 201.6 @ 4600 rpm
Largest Horsepower gain over stock 9.8 Hp @ 4600 rpm
Largest Torque gain over stock 10.6 @ 4600 rpm
Manufacturer Cobb Tuning
Sound Decibel @ Idle 97 dB
Sound Decibel @ 3000 rpm 103 dB
Peak Horsepower 200.0 Hp @ 5600 rpm
Peak Torque 202.7 @ 4000 rpm
Largest Horsepower gain over stock 12.6 Hp @ 4400 rpm
Largest Torque gain over stock 14.1 Tq @ 4400 rpm
Manufacturer Supersprint
Sound Decibel @ Idle 95 dB
Sound Decibel @ 3000 rpm 101 dB
Peak Horsepower 198.0 Hp @ 5700 rpm
Peak Torque 201.3 Tq @ 3700 rpm
Largest Horsepower gain over stock 12.2 Hp @ 4400 rpm
Largest Torque gain over stock 13.7 Tq @ 4400 rpm
Manufacturer HKS
Type Hi-Power
Sound Decibel @ Idle 97 dB
Sound Decibel @ 3000 rpm 102 dB
Peak Horsepower 202.9 Hp @ 5625 rpm
Peak Torque 204.9 Tq @ 3650 rpm
Largest Horsepower gain over stock 13.1 Hp @ 5620 rpm
Largest Torque gain over stock 13.6 Tq @ 4200 rpm
Manufacturer A'PEXi
Type GT Spec.
Sound Decibel @ Idle 100 dB
Sound Decibel @ 3000 rpm 104 dB
Peak Horsepower 201.1 Hp @ 5625 rpm
Peak Torque 201.5 Tq @ 4600 rpm
Largest Horsepower gain over stock 9.9 Hp @ 4600 rpm
Largest Torque gain over stock 10.6 Tq @ 4600 rpm
и т.д.