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02-04-2022, 04:33 PM | #1 |
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750i original exhaust modification
Hello everyone, new owner of g12 750i, i have stock exhaust not m and i want to make it louder and deeper v8 type sound, my last car was audi a7 3.0 tfsi, i did electrical valves behind rear mufflers and car sounded very deep and not to loud but not to quiet either (3x sound as stock). With g12 i have watched all youtube videos and read many threads on internet but cant decide what to delete: resonator or make flaps behind rear mufflers ( same as muffler delete ), looking for help from members who have did this muffler or resonator delete thanks and goodbye.
my a7 sound: https://youtube.com/shorts/bdWhHcjooZ4?feature=share |
02-04-2022, 06:37 PM | #2 | |
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I'll see if I can upload a video I took which is better. Videos don't do it justice. It sounds sick and 0 drone which was my goal. I came from an M5 and hellcat and wanted the 7 to be a little more alive.
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*** SOLD *** 2013 BMW M5 | Space Grey | MSR Stage 3 Tune | Catless Downpipes | MSR Intake and Charge Pipes | MSR Exhaust (Prototype) | Vorsteiner Rear Diffuser | RW Carbon Front Lip | RW Carbon Trunk Spoiler| Vorsteiner VS-310 Forged Wheels | Escort 9500CI w/Laser Jammers
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02-17-2022, 01:59 PM | #5 |
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Everything that I've seen so far, is if you want to change the sound, remove the muffler all together. not a whole lot of mods I've been able to find. But here's a link to a straight piped 750. Linked it to where they show the muffler delete, but earlier on they do just the 2 resonator removal with an X pipe.
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02-18-2022, 01:01 PM | #8 |
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Removing resonators and mufflers at the same time will cause lots of drone.
I seen the video of the straight pipe 750 and I don't think the guys doing the jobs are reputable. An exhaust tech should know before hand how a twin turbo engine would react to a resonator delete and a muffler delete. Best option which is probably the most expensive option is cat-less downpipes and an X pipe instead of the resonator while leaving stock mufflers on. This gets expensive because of the added tune you would need to hide the check engine for the O2 sensors but you get non restricted airflow and pure turbo spool with the aggressiveness in sport mode. I have catless DP on now with everything else stock and it sounds great. Thinking do to the X pipe now instead of the resonator. |
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02-20-2022, 09:54 AM | #9 | |
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*** SOLD *** 2013 BMW M5 | Space Grey | MSR Stage 3 Tune | Catless Downpipes | MSR Intake and Charge Pipes | MSR Exhaust (Prototype) | Vorsteiner Rear Diffuser | RW Carbon Front Lip | RW Carbon Trunk Spoiler| Vorsteiner VS-310 Forged Wheels | Escort 9500CI w/Laser Jammers
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02-20-2022, 11:25 AM | #10 | ||
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Only reason I'm not switching from the M muffler is because of the valves and the way it sounds in sport mode. Sounds too good during downshifts. Did you have the M muffler too stock? |
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02-20-2022, 11:27 AM | #11 | |||
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*** SOLD *** 2013 BMW M5 | Space Grey | MSR Stage 3 Tune | Catless Downpipes | MSR Intake and Charge Pipes | MSR Exhaust (Prototype) | Vorsteiner Rear Diffuser | RW Carbon Front Lip | RW Carbon Trunk Spoiler| Vorsteiner VS-310 Forged Wheels | Escort 9500CI w/Laser Jammers
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03-07-2022, 07:42 PM | #12 | |||||||
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I have the M muffler as well that's why I didn't change it. From what I have gathered is that the M muffler makes a huge difference in sound. My car too sounds great at downshifts in sport mode and can be quiet in comfort. I assumed all G12's came with the M mufflers TIL |
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04-25-2024, 09:58 AM | #14 |
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Anyone know the part number for the M muffler? My car has the M package but using BM3, I'm not convinced my car has valves on the muffler. I bought it used so won't be surprised if someone swapped the wrong part after a repair or something. High Flow cats didn't make nearly any change in sound. My x7 saw a huge improvement with same cats.
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06-17-2024, 01:35 AM | #15 | |
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06-17-2024, 04:52 AM | #16 |
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Cats are not going to change the sound. You'll need to change mufflers if you want more sound.
Did you look to see if the valves are present and functional? You can see them... Last edited by BlackM750i; 06-17-2024 at 05:19 AM.. |
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06-17-2024, 12:28 PM | #17 |
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Not 100% sure where to look, plus it's impossible to get all the way under the car without lifting it. I need to just take it to a muffler shop and take a closer look.
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