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      03-11-2017, 04:49 PM   #133
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Quote:
Originally Posted by Figurka View Post
Get a AA or Remus mid pipe.
That's what I figured. Thanks!!
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      03-11-2017, 05:45 PM   #134
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Quote:
Originally Posted by LukeM15 View Post
That's what I figured. Thanks!!
Remus non resonated with ZCP

https://youtu.be/1D1gTeAl4X0

AA sounds very similar
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      03-14-2017, 09:47 PM   #135
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Are their any more vids of the secondary cats replaced with Magnaflows and the resonator replaced as well? The one vid in first post sounds decent, but would love to hear more vids in different situations. I searched Youtube and come up short. To anybody that has done this configuration with a stock exhaust, please chime in on your opinion of this set up please. Thanks!
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      08-24-2017, 10:59 AM   #136
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just did the same thing on my car and it sound awesome. No need for $3k+ exhaust system
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      08-24-2017, 12:07 PM   #137
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That sounds really nice! I was just going to do catless dp's and 2nd cat delete. Guess I'll give these resonators a shot
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      08-24-2017, 12:08 PM   #138
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What exactly did you do?
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      08-24-2017, 05:16 PM   #139
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Replaced secondary cats with Magnaflow race mufflers and replaced resonator with Magnaflow X pipe
Same thing OP did
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      08-30-2017, 10:10 PM   #140
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Quote:
Originally Posted by rezN View Post
Replaced secondary cats with Magnaflow race mufflers and replaced resonator with Magnaflow X pipe
Same thing OP did

Videos pleeeeease!
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      10-08-2017, 07:31 PM   #141
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Quote:
Originally Posted by parky1215 View Post
I don't have much problem with drone with valve open unless I am going really slow in 7th gear. My magnaflow straight muffler take care of drone on most rpm. I am putting x-crossover to increase flow (take out stock resonator) and also to make it sound deeper and produce more popping noise. Hopefully it will bring good result!
Thanks for all of the info parky!

I’m really interested in doing this but my car is leased. You think it would cause any trouble to just remove it and re weld stock parts at lease turn in?

Thanks!
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      10-12-2017, 12:41 PM   #142
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Wow nice work thanks for sharing. Imo I like the last clip of the resonator relived and the magnaflow x pipe installed. It gave the exhaust noise some much needed character.

Are you also running catless down pipes? Sorry if I missed it.
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      03-30-2018, 07:37 PM   #143
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Quote:
Originally Posted by parky1215 View Post

















Update: 8/25/2015
I now have new midpipe setup with stock resonator removed.
Once I removed it, I realized how much stock resonator is dampening the sound especially at higher rpm.
With Magnaflow x-pipe installed in place of stock resonator, I can hear much more gurgling/popping noise from the exhaust system.




Stock resonator is a H-pipe and resonator in a single unit.

H-pipes allow a cross-flow to occur between the sides. The passage of this cross-flow is restrictive because it is at a 90 degree angle to the main straight flow. The advantage to an h-pipe is that it does not add resistance to the main flow paths.

Straight pipes have lower flow losses then curved pipes. X-pipe as pictures is a curved pipe that placed flow directly into a area with the second pipe's flow.





"The S55 engine has a different exhaust system structure than in the N55 engine. It uses two mono scroll turbochargers instead of the single twin-scroll turbocharger of the N55.The exhaust system is
a twin-pipe system in relation to the cylinderbanks 1and2.
The exhaust system was designed for minimum exhaust backpressure.The gas exchange efficiency
was further optimized by sport tuning and intelligent light weight construction."

In short I would trust the factory tested and designed H-pipe resonator for the most power over a generic X-pipe that appears to be more restrictive in the center of the x..

Last edited by overlook637; 11-14-2018 at 08:06 PM..
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      10-21-2018, 03:41 PM   #144
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Hey,

Excellent and informative thread.

Thank you!!


Cheers!

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      11-14-2018, 08:02 PM   #145
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Had the Magnaflow 14156 installed. 95$ for the install and 90$ per resonator from amazon So 300$ for the project. Other than BM3 tuning; I can't think of a better bang for the buck upgrade.
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      11-14-2018, 08:27 PM   #146
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How’s it sound on the inside? Any drone? Do you get any more burples or crackling?
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      12-08-2018, 12:37 AM   #147
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Has anyone done this with catless downpipes and a zcp exhaust?
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      05-22-2019, 05:11 AM   #148
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Im trying this. Thank you 🙏
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      11-13-2019, 08:07 AM   #149
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Still Valid to Try?

Reopening this. I cant see any of the photos and cant find hardly any video of the sound. Can others chim in if they have done this or over time now, what their thoughts are?
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      11-13-2019, 09:05 AM   #150
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Here is my modded OEM set-up:

stock downpipes with primary cats
stock midpipes w/ secondary cats
center resonator/crossover delete
new equal-length driver/passenger side pipes to new crossover h-pipe location (now behind rear diff)
stock OEM muffler

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      11-13-2019, 02:37 PM   #151
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Wow I think you've done a fantastic job there, it sounds so much cleaner than stock. I've been looking at incorporating some aero exhaust resonators on mine, there very well built and compact fitment.im curious how it will sound.
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      11-13-2019, 04:32 PM   #152
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Thanks, not quite done. Im trying to get a shop to fabricate an x-pipe where my custom h-pipe is currently (behind rear diff).

The tone and snarly sound is due to equal-length pipes for both sides and the crossing over at the h-pipe. The stock downpipes have a difference of over 15" between front and rear banks so it causes that typical S55 truck-ish down low and buzzy up top sound.
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      11-13-2019, 05:38 PM   #153
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Do you find the h or x pipe to work better at the rear end? Reason I ask is that when researching x pipe location the majority say to mount them around the transmission area.
Apparently some would put a thick crayon line on the front sections then drive for 20 mins and where the crayon stopped melting that was the desired place for the x pipe.
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      11-13-2019, 05:52 PM   #154
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no, my reasoning was more for packaging as I needed to create the equal-length piping by adding extra pipes for the rear-bank pipes (US passenger side, UK drivers side) before they merged at the crossover.

Speaking of crossovers, the scavenging benefits of them aren't as apparent on turbo'ed cars, the turbos create their own exhaust velocity and pipe diameter is a more important factor to get exhaust gases out. Although it does have some scavenging benefits, its not as great as on a naturally aspirated car, so the location isn't as important for us.
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