Sounds like a real V8 now...finally!
05-27-2011, 11:34 AM
#11
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My Ride: 2008 550i, M Sport, Platinum Gray, Logic 7, Navigation, Comfort Access
Congrats in your mod! I had the resonators removed on my 550i as well and replaced with a y pipe. I agree with you that my car sounds much more aggressive than it did before.
05-27-2011, 12:38 PM
#12
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My Ride: 2008 550i Jet Black on Black Leather, SAT with Paddles, Logic 7, Comfort Seats, NAV, Sport Package, PDC, Xenons, Sirius, Trinity 12W LED Angel Eyes, RPi GT Exhaust, M rear spoiler, ACS Roof Spoiler, Tinted Tail Lights, Bimmian Carbon Fiber Pillar Trim, Bimmian Shadow 550i emblem, RPi Scoop, E60 Forum Cling, Mtec bulbs in fog lights, Mtec 2W LED for License Plate Light Bulbs, K&N Filter, Bimmian LED Smoked Side Markers, Blackout roundels, Carbon Fiber Kidney Grills.
Retired Rides - 1989 325i convertible, 1995 M3, 2002 X5, 2005 545i, 2008 X5 (Lemon)
05-27-2011, 12:54 PM
#13
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My Ride: 2005 BMW 545i, Silver Grey, Sport Package, R. Shades, Cold Pkg, Sat. Rad., Prem. Sound.
Guys/Gals,
The resonators' main purpose is not back pressure. It is to minimize certain frequency so you do not hear the droning at certain exhaust pressure load. When that does not reduce the sound level down to an acceptable level, a combination of mufflers (downstream) and valve(s) are used. The droning frequency is around 90 hz.
Look inside a resonator and all you see is a straight through design with preforation around the inside tube. There are variations, but that is base design for resonators. It is very much like cherry bombs with the exception that some cherry bombs have insulation filled between the inner tube and the outer cover.
The kink in your pipes will not produce backpressure either. Your OEM muffler is what is still creating the backpressure.
Now, if you remove your muffler, put in either a H pipe or X pipe, that does create some back pressure. The exhaust sound is mainly tuned by the muffler you used. Do your research and it will save you some headache (no puns intended) and ask questions before proceeding.
The resonators' main purpose is not back pressure. It is to minimize certain frequency so you do not hear the droning at certain exhaust pressure load. When that does not reduce the sound level down to an acceptable level, a combination of mufflers (downstream) and valve(s) are used. The droning frequency is around 90 hz.
Look inside a resonator and all you see is a straight through design with preforation around the inside tube. There are variations, but that is base design for resonators. It is very much like cherry bombs with the exception that some cherry bombs have insulation filled between the inner tube and the outer cover.
The kink in your pipes will not produce backpressure either. Your OEM muffler is what is still creating the backpressure.
Now, if you remove your muffler, put in either a H pipe or X pipe, that does create some back pressure. The exhaust sound is mainly tuned by the muffler you used. Do your research and it will save you some headache (no puns intended) and ask questions before proceeding.
05-28-2011, 06:39 AM
#14
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Congrats. You should put a X-pipe in.
Anxious to hear how it'll sound too. Wonder how different it'll sound compared to my old 545i with Cherry Bomb glasspacks. Man I miss that sound.
Anxious to hear how it'll sound too. Wonder how different it'll sound compared to my old 545i with Cherry Bomb glasspacks. Man I miss that sound.
05-28-2011, 08:55 AM
#15
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My Ride: 2008 550i, M Sport, Platinum Gray, Logic 7, Navigation, Comfort Access
With the resonators removed, I havent had any issues with droning. Just a nice aggressive sound when I step on the throttle.
05-28-2011, 03:35 PM
#17
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My Ride: 05 545i | sliver grey metallic | SMG trans | sports package | premium | cold weather | HUD | navi | PDC | sunshades | logic 7 | Ipod |
MODS - (Mtech v2 angels )(8000k headlights and fogs)( Full Xenon kit) (///M shifter) (LCI u.s spec tails)
(285/30/20 & 255/30/20 beyern baroque 3pc rims)
03 FX45 AWD | silver| sports package| premium package| (WIFE)
(sold)06 330i | cherry red | sports package| premium | cold weather | logic 7 | Ipod | ( WIFE )
This will be my next mod I'n a week or so but if you go on YouTube it's a 545 with the resonator delete mod on a stock muffler
YouTube search is : BMW 545 resonator delete
YouTube search is : BMW 545 resonator delete
06-06-2011, 03:50 PM
#20
I cant speak to the v8 but when I removed the resonators on my I6 it only made the exhaust note more "garbly" and not a clean sound. Thought it sounded a lot worse even though it was louder. This was with an rpi muffler
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