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Old 02-01-2003, 04:13 PM   #1
Scooby Specialist
Member#: 16696
Join Date: Mar 2002
Chapter/Region: MWSOC
Location: Baraboo, WI
2002 WRX Sedan Stg2
2013 OBW roll'n at 30+mpg

Post Exhaust dB measurements

I finally got around to de-catting the rest of my exhaust...
all measurements taken 1 meter away (around 39") from the tip directly in line with it... "C" weighted & "slow" response...

-the before-
Gutted uppipe, stock DP, stock 3rd cat, & Borla cat back.
Idle - 100.5dB
3k rpm no load - 107.5dB
5k rpm no load - 104.0dB

-the after-
Gutted uppipe, Stromung cat free DP, 3rd cat eliminator, & Borla cat back. (a full 2.5" turbo back)
Idle - 99.75dB
3k rpm no load - 111.0dB
5k rpm no load - 109.0dB*
*on letting off the gas, the exhaust "rapped" or "burbled" to 116+dB (very tough sounding)

The general popping or "after fire" is much more prounced, the exhaust has a very hollow sound & you can hear EVERY little thing from each exhaust pulse, to the turbo spooling.
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