Thread: Exhaust dB data
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Old 12-07-2004, 02:09 PM   #1
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OMGHi2U Exhaust dB data

In an effort to dispel some of the myths and confusion with regard to which exhaust is quiet or loud, I have come up with some comparative data for NASIOC users. This may help indivduals who live in remote areas or areas where few different exhausts are located to determine which exhaust is right for them.

Testing policy:
a. All measurement are and will be taken with an Exetech digital dB meter with an accuracy of plus or minus 2db using the same settings at the same distance.
b. All idle measurements are taken at warm idle, NOT cold (higher RPM) idle, and then 3000RPM.
c. All measurements are taken 6" from the tailpipe.
d. All measurements are averaged, not peak high or peak low as the exhaust dB can vary 5-10dB due to the boxer motor characteristics.

Today I measured a 100% stock 2002 WRX to "zero" my meter with the previous testing results of Turbo & High Tech Performance Magazine's data. Their data has been used as well to broaden the information as they tested some unique exhausts.

With every Subaru Meet I go to, I will bring the dB meter with me and do testing. I will bump this thread with each addition.

I won't post the results here as the bulletin board's software screws up all the cool formating, but you can download it from my server via these two links:

.xls file (MS Excel format) 31 kB

.txt file (the format will be messed up slightly) 8 kB

Exhausts tested so far:

5Zigen
A'PEXi
APS 3" & 3.5"
B&B
Blitz
Borla (XR-1 and Hush)
Bosal
Brullen
CES
Cobb Tuning
Espelir
Fujisobo
Greddy (EVO and SP2)
Helix
Heyward and Scott
HKS (Hi-Power and Carbon Ti)
Invidia
JIC
MRT
M2 Performance
Prodrive
RSR
Skunk2
SPT
Stromung (single and dual tip)
Supersprint
Tanabe
Tenso R
Thermal Research & Development
Tom Motorsports
Trust
TurboXS (Magnaflow & RFL)
Worx Tuning
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Last edited by Unabomber; 08-29-2005 at 09:37 PM.
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