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      10-05-2012, 04:54 PM   #1
MikeE92M3
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So I started a thread about custom Magnaflow mufflers...

And this will be the finish. Got everything installed today on my day off. As some of you may remember, I had installed the Magnaflow 14816 Mufflers and while I loved how it sounded, the drone was a bit much. My solution consisted of ordering a Magnaflow True X pipe, Aero AR25 Resonators, and OBX generic resonators. Why? I was going full custom. I already had my secondary cats taken off and replaced with straight pipes for those who had seen my post a few months back. To solve the drone issue, I used the helmholtz formula to create helmholtz chambers to cancel out the drone frequencies. This is what the OBX universal 2.5" resonators were for. For those who don't know, the OEM x pipe is crap--there is just a small "hole" where the exhaust gasses are supposed to crossover. Compared to the new magnaflow X pipe, this one was wide open. I already knew there were gonna be some positives with the new X pipe once I compared the two. The resonators replaced the OEM ones just past the x pipe. They fit perfectly. I had my tech create new pipes from the resonators back to the mufflers. Very straight through design with very few bends. He tried to make both of them perfect, and I think he did. The helmholtz chambers were created just as they are meant to perform, I needed roughly 13 inches to cancel out the frequencies, and they are placed where they belonged. I used the AA exhaust as a reference for the location where the pipes were to come off a 90 degree angle. 3 hours later, my new exhaust was done. The result? Absolutely little to no rasp, ZERO drone, and Immediate notice of more "pick up" with the new x pipe. He polished up the welds, especially on the helmholtz chambers, and they look fantastic. Really aggressive from behind. I absolutely love it and it is the most perfect thing I have heard besides women's sexual moans. Let's not go there. Of course, I will provide pictures and stand by for a sound clip either tomorrow or Sunday. I spent about $800 overall on EVERYTHING, including labor and parts. Couldn't be happier.

Pics:



















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      10-05-2012, 07:38 PM   #2
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Great job! Could you come up with a vadio?
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      10-05-2012, 08:14 PM   #3
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Happy you like it!
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      10-07-2012, 01:08 PM   #4
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would love to hear how this sounds
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      10-07-2012, 11:36 PM   #5
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Happy you like it!
I love it! Thanks
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      10-07-2012, 11:38 PM   #6
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Quote:
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would love to hear how this sounds
Will make a video soon. Had a wedding to go to this past weekend so I didn't have time. It sounds AWESOME. It sounds like a wicked/pissed off combination of an exotic/almost muscle like, but this is how the V8 comes to life!
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      10-07-2012, 11:41 PM   #7
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Now I just need to get a rear diffuser to tie it all in.
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      10-11-2012, 09:50 AM   #8
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Quote:
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Now I just need to get a rear diffuser to tie it all in.
Now you just need a video clip so I can hear this!
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      10-11-2012, 09:53 AM   #9
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Now you just need a video clip so I can hear this!
I will as soon as I can, bro! I will take one from inside the car too which is where I noticed the biggest change and it is where I am all smiles
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      10-11-2012, 11:32 AM   #10
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Why are they crooked?
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      10-11-2012, 12:01 PM   #11
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Why are they crooked?
Must be how they look in the pictures. Everything was measured to be perfectly straight and level. Regardless, I need a diffuser to clean everything up.
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      10-11-2012, 12:18 PM   #12
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How did you determine the necessary length of the helmholtz chambers? Thanks for sharing all of this.
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      10-11-2012, 12:45 PM   #13
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Quote:
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How did you determine the necessary length of the helmholtz chambers? Thanks for sharing all of this.
I used a formula that I had seen on another thread for a different car (350z) Formula is V/WV (Velocity/Wavelength) standard.

V=1187 Ft/Sec for soundwaves (standard wavelength speed)

You have to find out what frequency (Hz) your drone is prevalent at. I measured anywhere from 160-180 hz, depending on what gear, in my car. So Lets say 165-175 Average. I will do 175 for the purpose of this solution.


1187(wavelength)/175 (hz, drone frequency) = 6.78

Take 6.78, divide it by 4 (conversion) (6.78/4) and you have 1.69 feet (14 inches)

The pipe needs to be at least 14 inches to cancel out the drone.


Hope this makes sense. It took me a few minutes to grasp it but once you measure the drone frequency with a microphone or app (I used a HZ app on my iphone), it is easy to do the math from there.
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      10-22-2012, 12:03 PM   #14
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Great thread, very informative. Question for you is there a hole at the end of the capped off resonator? Seems like there is one right in the middle of the cap.
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      10-22-2012, 01:52 PM   #15
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Quote:
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Great thread, very informative. Question for you is there a hole at the end of the capped off resonator? Seems like there is one right in the middle of the cap.
Nope, no holes. Fender washers were used to cap the ends, and there was a tiny hole that was welded shut, which is probably why it looks to be that way.
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      10-23-2012, 12:06 PM   #16
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I've been a long time fan of Magnaflow, any sound clips?
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      10-23-2012, 12:11 PM   #17
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I've been a long time fan of Magnaflow, any sound clips?
Yeah!! Where are the clips!!

*starts lynch mob outsides Mikes office*
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      10-23-2012, 03:00 PM   #18
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Yeah!! Where are the clips!!

*starts lynch mob outsides Mikes office*

SOON!!! Haha! I will be home next weekend and I can make a nice clip of various driving and RPM ranges. I will be sure to let you all know when it is done
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      10-23-2012, 03:56 PM   #19
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Quote:
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Why are they crooked?
I noticed this with most aftermarket setups on this car (even really high end setups)..the tips and spacing around the bumper cover never look quite as aligned as OEM..
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      10-23-2012, 04:31 PM   #20
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      10-23-2012, 07:03 PM   #21
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1.69ft is more than 14inches by my calculator...?
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      10-23-2012, 07:27 PM   #22
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1.69ft is more than 14inches by my calculator...?
Haha it may have been off slightly, but it was the minimum needed. If you need to cancel out a certain frequency and it requires 12.45 inches or whatever, anything from that and longer will be successful.


I have Turner Test Pipes ordered and cannot wait for them to come in
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