Exhaust Quieter at Higher RPM
10-12-2009 | 10:22 PM
#1
Thread Starter
Members
Joined: Jan 2009
Posts: 122
Likes: 0
Like the title says, its strange that my cars exhaust is louder at 3-4rpm and then kinda quietens down above that. Almost becomes stock sounding. For references sake, if I rev the car, at 4k rpm, a decibel reading might be say, 105 db. At 5rpm, its about 95db. Is it just me or
should high RPM be louder?
I have a custom exhaust, but I'm guessing it shouldn't really matter since even with any sort of muffler, higher RPM should STILL be louder or just as loud as lower rpms? Someone please correct me on this as this is mind boggling.
should high RPM be louder?
I have a custom exhaust, but I'm guessing it shouldn't really matter since even with any sort of muffler, higher RPM should STILL be louder or just as loud as lower rpms? Someone please correct me on this as this is mind boggling.
10-12-2009 | 10:31 PM
#3
Contributors
Joined: Oct 2004
Posts: 14,776
Likes: 0
From: So Cal, USA
My Ride: 545iSMGSilver GrayAuburn Dakota LeatherLogic 7 Premium SoundSports Package
Originally Posted by yezero' post='1031094' date='Oct 12 2009, 10:22 PM
Like the title says, its strange that my cars exhaust is louder at 3-4rpm and then kinda quietens down above that. Almost becomes stock sounding. For references sake, if I rev the car, at 4k rpm, a decibel reading might be say, 105 db. At 5rpm, its about 95db. Is it just me or
should high RPM be louder?
I have a custom exhaust, but I'm guessing it shouldn't really matter since even with any sort of muffler, higher RPM should STILL be louder or just as loud as lower rpms? Someone please correct me on this as this is mind boggling.
should high RPM be louder?
I have a custom exhaust, but I'm guessing it shouldn't really matter since even with any sort of muffler, higher RPM should STILL be louder or just as loud as lower rpms? Someone please correct me on this as this is mind boggling.
10-12-2009 | 11:05 PM
#5
Members
Joined: Feb 2009
Posts: 196
Likes: 0
From: So Cal
My Ride: 2006 530i
Black/Black
Premium/Sport Package
Bluetooth
iPod Retrofit
Matte Black Grills
HID Fogs 5000K
BMC Filter
RPI GT Exhaust
RPI Scoop
M-Tech Front
I noticed this also with my RPI exhaust. Quieter at 3k and above.
10-13-2009 | 06:40 AM
#6
Contributors
Joined: Nov 2007
Posts: 83
Likes: 0
From: Dublin, CA
My Ride: 2004 (7/04) 545i 6-Spd Manual Metallic Silver Gray with Gray Interior
Premium Pkg, Premium Sound, Sport Pkg, Cold Weather, Active Steering, Navigation, Rear Sunshades, Folding Rear Seats, Rear Side Shades, Logic 7, Comfort Seats, Rear Heated Seats, HUD, Rear Side Airbags, PDC, Bluetooth Retrofit
Exterior: Venture Clear Bra, Bright Angel Eyes, Euro Reflectors, Blackened Grill, VMR 713 19" Staggered with General UHPs, 13% tint rear windows
Engine: K&N Air Filter, Deleted Carbon Filter , RPI Scoop, RPI Exhaust
Originally Posted by flipnf3rno' post='1031116' date='Oct 12 2009, 11:05 PM
I noticed this also with my RPI exhaust. Quieter at 3k and above.
Thread
Thread Starter
Forum
Replies
Last Post