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Vez · 02-25-2009, 03:21 PM

Again, measurements taken from 50'...

Idle: 54 dB
Horn: 84
4th Gear@45MPH: 75
5th Gear@45MPH: 72
6th Gear@45MPH: 69

So, like I've previously stated, when I'm at 45 MPH I'm either in 4th or 5th gear. This puts me at an average of 73.5 dB...2.5dB over the average I found. I truly believe the lower pitch of the exhaust note, especially in the lower gears, makes it sound "louder", and it may actually be louder than a stock STI exhaust... albeit not by much, but I think it's this lower pitch which produces the effect that makes it seemingly sound louder.

My other measurements:
4th@3k RPM: 75
4th@4k RPM: 76
4th@5k RPM: 82

5th@2k RPM: 71
5th@3k RPM: 76
5th@4k RPM: 79

6th@2k RPM: 71
6th@3k RPM: 80

Based on the actual test results, I made the following approximations:
(Approximately) (Approximately)
1st Gear@30MPH 77 5500
2nd Gear@30MPH 74 3500
3rd Gear@30MPH 69 2500
4th Gear@30MPH - -
5th Gear@30MPH - -
6th Gear@30MPH - -

1st Gear@45MPH - -
2nd Gear@45MPH 81 5500
3rd Gear@45MPH 80 4500
(Actual)(Approximately)
4th Gear@45MPH 76 2500
5th Gear@45MPH 72 2250
6th Gear@45MPH 69

02-25-2009, 03:21 PM	#8
Vez Tri-State Training Wheels Join Date: Aug 2008 Location: Near Philly, PA Member #8445 My Ride: 2007 UGM Subaru Impreza WRX STI Ltd. #081/800 iTrader: (0)	Rest of the dB Readings Again, measurements taken from 50'... Idle: 54 dB Horn: 84 4th Gear@45MPH: 75 5th Gear@45MPH: 72 6th Gear@45MPH: 69 So, like I've previously stated, when I'm at 45 MPH I'm either in 4th or 5th gear. This puts me at an average of 73.5 dB...2.5dB over the average I found. I truly believe the lower pitch of the exhaust note, especially in the lower gears, makes it sound "louder", and it may actually be louder than a stock STI exhaust... albeit not by much, but I think it's this lower pitch which produces the effect that makes it seemingly sound louder. My other measurements: 4th@3k RPM: 75 4th@4k RPM: 76 4th@5k RPM: 82 5th@2k RPM: 71 5th@3k RPM: 76 5th@4k RPM: 79 6th@2k RPM: 71 6th@3k RPM: 80 Based on the actual test results, I made the following approximations: (Approximately) (Approximately) 1st Gear@30MPH 77 5500 2nd Gear@30MPH 74 3500 3rd Gear@30MPH 69 2500 4th Gear@30MPH - - 5th Gear@30MPH - - 6th Gear@30MPH - - 1st Gear@45MPH - - 2nd Gear@45MPH 81 5500 3rd Gear@45MPH 80 4500 (Actual)(Approximately) 4th Gear@45MPH 76 2500 5th Gear@45MPH 72 2250 6th Gear@45MPH 69 Last edited by Vez; 02-25-2009 at 03:33 PM.