This is how you make an S55 engine sound good!

Alan l. · 11-15-2019, 01:39 PM

Quote:

Originally Posted by spool twice

Adding length is simply just to balance the exhaust pulses equally between both banks before they crossover. I suppose in essence and effect, its "slowing" that bank down prior to crossing over with the drivers side.

So the passenger side is the one that needs "slowing down" since its shorter....

I am going to try swapping out the one of the magnaflow resonators that i currently have installed on my car with one that is twice as long just on the passenger side to see if it changes the tone any.

AMDM3 · 11-15-2019, 03:07 PM

Quote:

Originally Posted by Frode D

This thread gets me so excited! Cant wait to hear the newest versions form everyone.

I did a quick photoshop of a dual center exhaust on my car. I think it looks cool

Looks nice

spool twice · 11-15-2019, 03:18 PM

Quick video I made directly after finishing up with the x-pipe. The pipes are still clean (exhaust sounds actually change once they have soot or whatever coats the inner pipes). I'll get more video's after I put on a few more miles:

Some thoughts:

The X-pipe is pretty smooth sounding all around, especially in lower and mid rpm, and smoother sounding up top
The H-pipe delivers a more raw sounding howl at high rpm, but sounds more regular S55-like at low rpm.

Both set-ups have some rasp between 3,500-4,000rpm at 1/2 throttle (but gone at any other throttle position) due to the delete of that center resonator/crossover pipe. I bet if I can restore that OEM center resonator in there but weld the crossover section with straight pipes that rasp in that area would be gone.

GT_Juls · 11-15-2019, 03:23 PM

Quote:

Originally Posted by Frode D

This thread gets me so excited! Cant wait to hear the newest versions form everyone.

I did a quick photoshop of a dual center exhaust on my car. I think it looks cool

[QUOTE=Frode D;25464714]

I could live with that or even put quad and space it out like the E92 M3 style .

ntg44 · 11-15-2019, 03:48 PM

Quote:

Originally Posted by spool twice

Quick video I made directly after finishing up with the x-pipe. The pipes are still clean (exhaust sounds actually change once they have soot or whatever coats the inner pipes). I'll get more video's after I put on a few more miles:

Some thoughts:

The X-pipe is pretty smooth sounding all around, especially in lower and mid rpm, and smoother sounding up top
The H-pipe delivers a more raw sounding howl at high rpm, but sounds more regular S55-like at low rpm.

Both set-ups have some rasp between 3,500-4,000rpm at 1/2 throttle (but gone at any other throttle position) due to the delete of that center resonator/crossover pipe. I bet if I can restore that OEM center resonator in there but weld the crossover section with straight pipes that rasp in that area would be gone.

Interesting. I just took my car out again, and I noticed I'm getting a tiny bit of e46 m3-ish rasp in the same rpm range. And I also removed that resonator obviously. I'm starting to think that I either need to get larger resonators to replace the Magnaflows, or get a resonator after the merge. Consulting my fabricator and will report back. But my tone sounds completely different, will be very interesting to hear it on camera vs. yours when I get around to it.

RMDZidane · 11-15-2019, 04:40 PM

I just finished putting a video together of my midpipe design....and it sucks! All I did was succeed in making my M3 sound like an ATS-V

I won't post it.

MR_X · 11-15-2019, 05:41 PM

Quote:

Originally Posted by Frode D

This thread gets me so excited! Cant wait to hear the newest versions form everyone.

I did a quick photoshop of a dual center exhaust on my car. I think it looks cool

Considering the options we have posted, I think this is the best looking one. Think of it as weight reduction

spool twice · 11-15-2019, 06:10 PM

Quote:

Originally Posted by Alan l.

So the passenger side is the one that needs "slowing down" since its shorter....

I am going to try swapping out the one of the magnaflow resonators that i currently have installed on my car with one that is twice as long just on the passenger side to see if it changes the tone any.

In essence yes as its shorter by a foot and a half.

Ghosn · 11-15-2019, 09:56 PM

So long as we don't end up with this to achieve better sound, I'm happy.

Kilabyte · 11-15-2019, 11:34 PM

Quote:

Originally Posted by RMDZidane

I just finished putting a video together of my midpipe design....and it sucks! All I did was succeed in making my M3 sound like an ATS-V

I won't post it.

Post it. Did it sound anything like this? Because if it did then I want to buy it

Frode D · 11-16-2019, 04:34 AM

Quote:

Originally Posted by RMDZidane

I just finished putting a video together of my midpipe design....and it sucks! All I did was succeed in making my M3 sound like an ATS-V

I won't post it.

Can you please post it?

Sound is subjective and its interesting to hear what different setups sound like.

MR_X · 11-16-2019, 06:06 AM

Quote:

Originally Posted by Ghosn

So long as we don't end up with this to achieve better sound, I'm happy.

Don't forget the Ferrari F40 had 3 exhaust tips also

MR_X · 11-16-2019, 06:07 AM

Quote:

Originally Posted by Kilabyte

Post it. Did it sound anything like this? Because if it did then I want to buy it

Not a fan of that sounds. It sounds like a 350Z.

RMDZidane · 11-16-2019, 11:23 AM

Quote:

Originally Posted by Kilabyte

Post it. Did it sound anything like this? Because if it did then I want to buy it

No way, I'm not posting it. That ATS-V sounds better!

I think I just don't like the sound characteristics of the stock muffler system.

I have a couple adjustments I'll make next week after my car gets more warranty work done, and then I'll move on to the last M3 exhaust project I have.

RMDZidane · 11-16-2019, 11:25 AM

Quote:

Originally Posted by Frode D

This thread gets me so excited! Cant wait to hear the newest versions form everyone.

I did a quick photoshop of a dual center exhaust on my car. I think it looks cool

I like the way that looks too. Especially if it's an M3 that sounds good

In fact I'd like any single exit as long as the diffuser matched. To me I6's seem more natural with a single exit.....at least the fast ones

ntg44 · 11-16-2019, 03:19 PM

Ok so I was able to get to some standing revs of my exhaust. I need to work on the small bit of rasp around 3500 RPM - I think it might be my single walled tip resonating at that rpm, but after hearing it outside of the car, honestly I think it sounds like it's naturally aspirated haha. Here you go:

GT_Juls · 11-16-2019, 03:31 PM

Quote:

Originally Posted by ntgarage44

Ok so I was able to get to some standing revs of my exhaust. I need to work on the small bit of rasp around 3500 RPM - I think it might be my single walled tip resonating at that rpm, but after hearing it outside of the car, honestly I think it sounds like it's naturally aspirated haha. Here you go:

Holy crap please do a WoT pull that sounds amazing

phoenx · 11-16-2019, 05:53 PM

Quote:

Originally Posted by jboogie315

Holy crap please do a WoT pull that sounds amazing

Agreed. It sounds N/A to me.

ntg44 · 11-16-2019, 06:42 PM

Thanks all. Another big thing to point out is that this is a really beefy muffler. It's quieter than stock with valves open. So engine noise may be drowning out the exhaust tone a bit. A pull will be a better representation of what the tone sounds like, but I couldn't figure out scheduling with the person to record it. Will try ASAP to get a pull recorded.

Also, I may need to make the muffler smaller to fit a resonator in after the merge, so the tone may get even nastier afterwards.

RMDZidane · 11-16-2019, 07:01 PM

Quote:

Originally Posted by ntgarage44

Ok so I was able to get to some standing revs of my exhaust. I need to work on the small bit of rasp around 3500 RPM - I think it might be my single walled tip resonating at that rpm, but after hearing it outside of the car, honestly I think it sounds like it's naturally aspirated haha. Here you go:

Music to my ears

Alan l. · 11-16-2019, 07:05 PM

Quote:

Originally Posted by Alan l.

So the passenger side is the one that needs "slowing down" since its shorter....

I am going to try swapping out the one of the magnaflow resonators that i currently have installed on my car with one that is twice as long just on the passenger side to see if it changes the tone any.

Big fail for me today... bought the part and went back to my exhaust shop to find out the new magnaflow resonator is a tad too big to fit in the mid pipe location. I didn’t factor in the way the pipes bends upwards right at the mid brace area so installing a perfectly straight resonator wouldn’t work without some sharp bends that would hinder flow. The project would have been more than my fabricator could handle....

Alan l. · 11-16-2019, 07:08 PM

Quote:

Originally Posted by ntgarage44

Ok so I was able to get to some standing revs of my exhaust. I need to work on the small bit of rasp around 3500 RPM - I think it might be my single walled tip resonating at that rpm, but after hearing it outside of the car, honestly I think it sounds like it's naturally aspirated haha. Here you go:

Tone is good but def sounds quieter than stock at this point. I think it could sound amazing with a much smaller resonator type muffler.

Alan

11-15-2019, 03:18 PM	#377
spool twice Rainbow Racer 1008 Rep 2,539 Posts Drives: BMW M4cs Join Date: Sep 2010 Location: Tampa Bay, FL Area iTrader: (7) Garage List 2019 M4cs [0.00]	Quick video I made directly after finishing up with the x-pipe. The pipes are still clean (exhaust sounds actually change once they have soot or whatever coats the inner pipes). I'll get more video's after I put on a few more miles: Some thoughts: The X-pipe is pretty smooth sounding all around, especially in lower and mid rpm, and smoother sounding up top The H-pipe delivers a more raw sounding howl at high rpm, but sounds more regular S55-like at low rpm. Both set-ups have some rasp between 3,500-4,000rpm at 1/2 throttle (but gone at any other throttle position) due to the delete of that center resonator/crossover pipe. I bet if I can restore that OEM center resonator in there but weld the crossover section with straight pipes that rasp in that area would be gone. __________________ -Loe P.- Prior Car:'14 Audi S5 3.0t DSG [ APR ECU/TCU \| Pullies + basic bolt-on mods \| 10.861@127.90mph ] Current Car: F82 M4cs \| TT-RS \| On Order: i4 M50 Last edited by spool twice; 11-16-2019 at 07:14 AM..
	Appreciate 0 Quote

11-15-2019, 04:40 PM	#380
RMDZidane Private First Class 112 Rep 131 Posts Drives: Porsche 911 Turbo S Join Date: May 2013 Location: Los Angeles, CA iTrader: (0)	I just finished putting a video together of my midpipe design....and it sucks! All I did was succeed in making my M3 sound like an ATS-V I won't post it. __________________ 2019 AMG GTR 2001 911 Turbo 2021 Porsche Macan Turbo 2013 BMW X1 xDrive 35i
	Appreciate 0 Quote

11-15-2019, 09:56 PM	#383
Ghosn Lieutenant 464 Rep 495 Posts Drives: M3 Join Date: Dec 2015 Location: Melbourne iTrader: (0)	So long as we don't end up with this to achieve better sound, I'm happy. Attached Images __________________ 2018 ///M3 ZCP Mineral White \| Black Leather \| DCT Last edited by Ghosn; 11-15-2019 at 11:17 PM..
	Appreciate 1 Kilabyte3946.50 Quote

11-16-2019, 03:19 PM	#390
ntg44 Colonel 2889 Rep 2,147 Posts Drives: R8 4.2 Spyder Join Date: Aug 2018 Location: Chicago iTrader: (3)	Ok so I was able to get to some standing revs of my exhaust. I need to work on the small bit of rasp around 3500 RPM - I think it might be my single walled tip resonating at that rpm, but after hearing it outside of the car, honestly I think it sounds like it's naturally aspirated haha. Here you go:
	Appreciate 2 phoenx332.50 smiff57.50 Quote

11-16-2019, 06:42 PM	#393
ntg44 Colonel 2889 Rep 2,147 Posts Drives: R8 4.2 Spyder Join Date: Aug 2018 Location: Chicago iTrader: (3)	Thanks all. Another big thing to point out is that this is a really beefy muffler. It's quieter than stock with valves open. So engine noise may be drowning out the exhaust tone a bit. A pull will be a better representation of what the tone sounds like, but I couldn't figure out scheduling with the person to record it. Will try ASAP to get a pull recorded. Also, I may need to make the muffler smaller to fit a resonator in after the merge, so the tone may get even nastier afterwards.
	Appreciate 0 Quote