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      12-28-2015, 11:37 PM   #1
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Muffler delete vs boost actuated exhaust cutouts

Hope you're all still having fun on your holidays.

So I was thinking about an exhaust cutout vs doing a muffler delete because I'd prefer to avoid the drone for daily driving...doing catless downpipes and ziptied open muffler valves has already added some drone as is. My biggest reason for wanting to do a muffler delete is for larger tips (I've already bought the tubing and tips) and to hear the turbos better, but this might be my happy medium of more power when needed while keeping it DD quiet and not obnoxious.

My other question is more technical in what do you guys think about routing the exhaust valve vacuum lines to control the cutouts? My exhaust valves haven't been hooked up since I got it, so I'm not sure if the valves open the second I hit the M button, after a certain PSI or if I'm only WOT.

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      12-29-2015, 03:10 AM   #2
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Light reading - http://www.m3post.com/forums/showthread.php?t=414103
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      12-29-2015, 07:02 AM   #3
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I've had exhaust cut outs on my ZL1. They worked off an electric/remote valve that I can open/close at the touch of a button. Sounds amazing and I closed it when I didn't want to have drone.

Do you have stock resonators? On my M5 I had Catless Downpipes, stock resonators, and muffler delete and the drone and cabin noise was very obnoxious. I traded the stock resonators for a Magnaflow resonated X pipe and the cabin noise has been drastically reduced and 0 drone. Outside the cabin still sounds amazing. Not as raspy and has a very deep tone. This did sacrifice some turbo noise but it's still there and noticeable.





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      12-29-2015, 07:03 AM   #4
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Here is with stock resonators. You can see the difference is that top in raspiness and high pitch

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      12-29-2015, 11:47 AM   #5
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At the moment I've got a stock intake with drop-in filters, catless downpipes, stock resonator, the X5M has no factory installed x-pipe like the M5 does and then I've got a stock muffler with the valves ziptied open. Ultimately I want to have more depth to my exhaust so it sounds more like an M5, which I've read the x-pipe will help with that. I want to be able to hear the turbos, have a free flowing exhaust for power and I wanted as large of tips as possible (I bought the exhaust piping and tips before I'd done catless downpipes), but I've got some drone now, so proceeding with the muffler delete will only make it worse.

Hindsight I'm thinking I won't do the muffler delete, I'll still add an x-pipe and then look into doing these exhaust cutouts, either electric or boost actuated. Can you tell me the part # of which resonated x-pipe you installed? The reason I ask is because I replaced the stock resonated x-pipe on my 7 series with a normal x-pipe and it sounded terrible, so I'm trying to decide if I should do a normal x-pipe like in the pics below or copy you by doing a resonated since you're happy with the sound.

On the left is a stock X5M exhaust, on the right is aftermarket M5 exhaust. Point being once again that I don't have a stock x-pipe, so I'd have create my own location aft of the stock resonators vs you guys being able to get away with cutting out the stock x-pipe and adding a resonated one. Did you replace the resonators (they're pretty far apart from each other) and install a resonated x-pipe or did you replace the stock x-pipe with a resonated x-pipe?
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      12-29-2015, 01:17 PM   #6
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Quote:
Originally Posted by m5james
At the moment I've got a stock intake with drop-in filters, catless downpipes, stock resonator, the X5M has no factory installed x-pipe like the M5 does and then I've got a stock muffler with the valves ziptied open. Ultimately I want to have more depth to my exhaust so it sounds more like an M5, which I've read the x-pipe will help with that. I want to be able to hear the turbos, have a free flowing exhaust for power and I wanted as large of tips as possible (I bought the exhaust piping and tips before I'd done catless downpipes), but I've got some drone now, so proceeding with the muffler delete will only make it worse.

Hindsight I'm thinking I won't do the muffler delete, I'll still add an x-pipe and then look into doing these exhaust cutouts, either electric or boost actuated. Can you tell me the part # of which resonated x-pipe you installed? The reason I ask is because I replaced the stock resonated x-pipe on my 7 series with a normal x-pipe and it sounded terrible, so I'm trying to decide if I should do a normal x-pipe like in the pics below or copy you by doing a resonated since you're happy with the sound.

On the left is a stock X5M exhaust, on the right is aftermarket. Did you replace the resonators (they're pretty far apart from each other) and install a resonated x-pipe or did you replace the stock x-pipe with a resonated x-pipe?
On the M5 it doesn't have an X Pipe and the resonators are side by side in the mid section.

Muffler delete will definitely increase noise levels but the resonated X pipe makes it perfect.

What you could do is replace your stock resonators with aftermarket like vibrant and add an X pipe. This should help a ton. The stock resonators suck
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      12-29-2015, 02:51 PM   #7
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I wonder how much louder would it be if I delete my resonators and just straight pipe them.

Currently running catless downpipes and TMS muffler delete.
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      12-29-2015, 03:39 PM   #8
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Quote:
Originally Posted by MpowerMike
I wonder how much louder would it be if I delete my resonators and just straight pipe them.

Currently running catless downpipes and TMS muffler delete.
I have a local friend with an M5 and he has the RPI GTM system with no resonators and between him and I both cars with Catless Downpipes are equally loud and drone like crazy. The difference was the raspiness in the sound which was attributed to the stock resonators. After I changed them to the resonated X pipe. Cabin noise dropped by at least 70% and no more drone.

No resonators there will definitely be cabin noise and drone. Haha

For comparison sake, these are with stock Downpipes but you can see they sound the same. RPI GTM no resonators and Turner Muffler Delete with stock resonators. The stock resonators added this raspiness that was annoying to me inside and out.



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      12-29-2015, 11:30 PM   #9
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Quote:
Originally Posted by 13M5F10 View Post
I have a local friend with an M5 and he has the RPI GTM system with no resonators and between him and I both cars with Catless Downpipes are equally loud and drone like crazy. The difference was the raspiness in the sound which was attributed to the stock resonators. After I changed them to the resonated X pipe. Cabin noise dropped by at least 70% and no more drone.

No resonators there will definitely be cabin noise and drone. Haha

For comparison sake, these are with stock Downpipes but you can see they sound the same. RPI GTM no resonators and Turner Muffler Delete with stock resonators. The stock resonators added this raspiness that was annoying to me inside and out.



Just to add that this exhaust setup for RPI GTM is amazing..it's loud and it's great..I do have some drone but I'm not planning to change my set up anytime soon. Very happy. Active sound needs to be switched off!
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      01-12-2016, 01:30 AM   #10
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Quote:
Originally Posted by 13M5F10 View Post
On the M5 it doesn't have an X Pipe and the resonators are side by side in the mid section.

Muffler delete will definitely increase noise levels but the resonated X pipe makes it perfect.

What you could do is replace your stock resonators with aftermarket like vibrant and add an X pipe. This should help a ton. The stock resonators suck
Unfortunately my resonators aren't side-by-side, so I'd have to get additional tubing cut to do so. I've thought about adding a resonated x-pipe instead of just the plain x-pipe that I'd planned on installing. What Magnaflow muffler model # is that? I'm ordering a muffler for my other truck as well, so maybe I can combine shipping with the seller and save some money.
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      01-12-2016, 06:52 AM   #11
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Quote:
Originally Posted by m5james
Quote:
Originally Posted by 13M5F10 View Post
On the M5 it doesn't have an X Pipe and the resonators are side by side in the mid section.

Muffler delete will definitely increase noise levels but the resonated X pipe makes it perfect.

What you could do is replace your stock resonators with aftermarket like vibrant and add an X pipe. This should help a ton. The stock resonators suck
Unfortunately my resonators aren't side-by-side, so I'd have to get additional tubing cut to do so. I've thought about adding a resonated x-pipe instead of just the plain x-pipe that I'd planned on installing. What Magnaflow muffler model # is that? I'm ordering a muffler for my other truck as well, so maybe I can combine shipping with the seller and save some money.
Magnaflow 11386 Stainless Steel 2.5" Oval Muffler - you could always go with a custom x pipe and resonators separately.
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      02-02-2016, 11:36 PM   #12
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The Magnaflow 11386 is a 2.5" inlet...is the M5 not a 3" exhaust like the X5M?
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      02-02-2016, 11:42 PM   #13
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Quote:
Originally Posted by 13M5F10 View Post
On the M5 it doesn't have an X Pipe and the resonators are side by side in the mid section.

Muffler delete will definitely increase noise levels but the resonated X pipe makes it perfect.

What you could do is replace your stock resonators with aftermarket like vibrant and add an X pipe. This should help a ton. The stock resonators suck
Looking at your pics to find a muffler/resonator that's got 3" in/out...you've got a factory x-pipe installed just behind your resonator that's partially covered by the exhaust brace
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      10-21-2017, 04:31 PM   #14
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Quote:
Originally Posted by m5james View Post
Quote:
Originally Posted by 13M5F10 View Post
On the M5 it doesn't have an X Pipe and the resonators are side by side in the mid section.

Muffler delete will definitely increase noise levels but the resonated X pipe makes it perfect.

What you could do is replace your stock resonators with aftermarket like vibrant and add an X pipe. This should help a ton. The stock resonators suck
Looking at your pics to find a muffler/resonator that's got 3" in/out...you've got a factory x-pipe installed just behind your resonator that's partially covered by the exhaust brace
I've asked this question on his other post and trying to clarify, even messaged him... no response. As you stated his picture shows the oem xpipe still in place behind the brace and the oem resonators replaced with the 2.5" Resonated xpipe. It appears he has 2 xpipes nearly back to back. I'm confused... plus I would think the 3>2.5>3 in flow in itself would pinch performance.

I have catless downpipes and a muffler delete running 700whp. I'm going crazy trying to find the perfect solution to remove the drone and NOT hurt horsepower numbers. This looked like a viable option until I noticed the 2 xpipe pic. Maybe he straight pipes the oem xpipe after the Magnaflow Resonated xpipe was put in place of the oem resonators.

If you can find a 3" Resonated Xpipe please let me know.
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      10-24-2017, 08:49 PM   #15
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Search allmotor2000's posts, he added a couple Helmholtz resonators and even created a table used to determine at which RPM you get drone that'll help determine the size and length of the resonator. Another member on the X5M boards, protecon, took that same table and made it into a live Excel spreadsheet but I'm waiting for him to email it to me.
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      10-25-2017, 11:31 AM   #16
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Quote:
Originally Posted by m5james View Post
Search allmotor2000's posts, he added a couple Helmholtz resonators and even created a table used to determine at which RPM you get drone that'll help determine the size and length of the resonator. Another member on the X5M boards, protecon, took that same table and made it into a live Excel spreadsheet but I'm waiting for him to email it to me.
Thanks for the info
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      10-26-2017, 04:18 PM   #17
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