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2010 2011 BMW 5 Series Forum F10 BMW 5-Series (F10) Forums F10 / F11 5-Series Photos - Video - Media Installed & modified F10 M5 diffuser w/ Muffler Delete + Quad Tips on 550xi (Video)
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      04-20-2012, 09:45 AM   #1
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Installed & modified F10 M5 diffuser w/ Muffler Delete + Quad Tips on 550xi (Video)

I was itching to mess around with my shops neighbors 2012 550xi. I hated what he had going on with his rear end so I'm slowly revising it with my own twist, even though he was against every idea, he's slowly loving the out come

Anyway... I ordered the F10 M5 diffuser from getbmwparts.com. Once it arrived, I had it painted AW, and went ahead to test if it... figured it would be a direct swap, I was wrong. In order to fit the M5 diffuser, it was either modify the stock tips and shift them a few inches, or pick up Quad Tips and get em installed.

Ordered Magnaflow Performance 3" tips and went ahead to install em.



Didn't get to far when I realized the tips are too long, and theres hardly any room to move the tips over a few inches to clear the diffuser, so... off went the mufflers... and up went my boner when I decided to test drive the car without them.











The amazing deep growl was too good to pass up on and some convincing was in order. After having the owner test drive it without mufflers on the way hom and back to work, he was more than convinced he wanted to keep the mufflers off and just add the quad tips.

I had the exhaust chopped about 2" before the mufflers, welded an extension pipe to a y-splitter, and finally attached the tips. I figured 3" tips would have been big enough, but now I believe a pair of 4" tips would fit nice and snug. Having 3" tips, I ended up adjusting them to sit closer to the top of the exhaust tip cut out, otherwise they looked just a tad too small from long distance.

But wait... theres more. Upon orderding the diffuser, I also tried sourcing the center insert which was impossible to find, I called half a dozen shops who specialize in BMW Parts import, as well as dozens of dealerships, and researched for hours and no one was able to obtain it.

Upon installing the diffuser, I also realized that I need to replace the plastic trim that goes over the rear bumper support/carrier, it's called an adapter for some reason.


The part numbers on the X and M models don't match.
xi: 51127299970
M5: 51127203976

So without trimming the stock bumper carrier adapter, the diffuser will not even go on. Since the owner had previously backed into an object and had slight damage that he had repaired, the adapter plate wasn't replaced, and I found that it was cracked. With that discovery, I went ahead and started chopping it up.

Some chopping up later, and the diffuser fit nice and snug, but now I was missing the mounting points for the fins that come down the side of the exhaust. How it works is the the diffuser is secured between the bumper carrier adapter and this center plate thats mounted to the floor of the trunk. I had diffuser which didn't fit the carrier adapter, and an adapter that was missing half the mounting points because it had to get chopped off to accommodate the M5 diffuser, and on top of all that I was still missing the diffuser center insert, which I'm 100% sure won't fit unless you completely remove the non-M5 bumper carrier adapter.

Diffuser fitted, with a preview of what the tips would look like...


Welding in progress


Then, I decided that once the F10 M5 parts become a little bit easily obtainable, I would order the bumper carrier adapter, along with the bottom center cover (which by the way doesn't have any part numbers or diagrams listed by RealOEM.com) and the diffuser insert for a complete OEM M5 diffuser revision.

I wanted to make a temporary diffuser insert using a spare M-Tech diffuser I had laying around, while digging through the pile of Infiniti/Nissan/BMW parts, I found a carbon fiber G37 diffuser I had laying around for several years from a prototype project. Without giving it second thought, I went and cut out a big enough piece to fit in place of the M5 diffuser insert, but not without a few hours of cutting, flipping, drilling, trimming, and suffering from the carbon fiber itch did I get it to fit almost perfect. The end result looked awesome. I had successfully secured the insert to the bumper carrier and to the underpanel center cover with the bottom ends of the diffuser sandwiched in between for a really sturdy and reliable fitment. At the end of the day, diffusers go through a lot of wind pressure, especially at high speed, so it's important to secure everything as tight as possible, whether it's heavy duty clips, or screws w/ bolts.

Upon completion, I painted the diffuser insert flat black using plastidip to prevent any chipping and to disguise the CF trim since nothing else on the car was CF.

Before the post gets too long, here are some pictures and a start up video of the exhaust. When I get a spare hour, I'll upload some videos and feedback on the muffler delete prior to adding the extension pipe, after, and overall sound and performance affect.

Till then, enjoy some of the pics. (VIDEO IS AT THE BOTTOM OF THE POST)



In the middle of it all, I felt compelled to rip the ACS trunk wing... unfortunately it was mounted using windshield polyeurethane, and removing it wasn't even a task, nor a pain in the ass, it was literally nightmare. It was well worth it though because I really wanted to throw on the AW performance trunk spoiler on it I had laying around the shop.

All done up


Carbon Fiber:


Flat Black:




Some cool instagram'd photos I had done during the process for social teasing.


VIDEO:
http://www.facebook.com/photo.php?v=339208362801392
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      04-20-2012, 10:08 AM   #2
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That is with no mufflers, just the factory DP and section 1/2 bits??
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      04-20-2012, 11:06 AM   #3
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Sounds awesome
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      04-20-2012, 11:28 AM   #4
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Very nice project...good job.
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      04-20-2012, 02:41 PM   #5
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Great Job!!!! but the tips need to be bigger. I have heard Lacster is upgrading to 4" tips because the 3.5" he had did not fill the opening well.
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      04-20-2012, 03:35 PM   #6
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diffusor looks great but the ultra black'ed out tails looks ghetto as if the car got his taillights jacked lol

The tail lights is one of the best features of the f10....no reason to completely hide it. i would do a light tinted clear over them instead.

Alan
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      04-20-2012, 05:51 PM   #7
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Quote:
Originally Posted by E60orBust View Post
That is with no mufflers, just the factory DP and section 1/2 bits??
It's completely stock, usually I just remove the resonator, but it sounds a bit too raspy IMO so I went with removing just the mufflers and leaving everything else stock.

Quote:
Originally Posted by Alan l. View Post
diffusor looks great but the ultra black'ed out tails looks ghetto as if the car got his taillights jacked lol

The tail lights is one of the best features of the f10....no reason to completely hide it. i would do a light tinted clear over them instead.

Alan
He had work done to his car by another shop prior to meeting him. He had the ACS roof and trunk wing installed, black ebay emblems, black tails and reflectors. My goal is redo the tails in a very light smoke, paint the reflectors AW, and debadge the 550. I just installed the spoiler, so the transformation is almost complete.

I'll post some pictures tomorrow.
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      04-21-2012, 12:48 AM   #8
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Let's hear you rev that sucker!!!
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      04-21-2012, 10:26 PM   #9
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Good call on the tail lights, it needs to be lighter with a shade of red perhaps. Black tails are so played out.

Cheers!
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      04-21-2012, 11:17 PM   #10
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looks like the placement of the mufflers are very similar to the 535 from axle back! would the axle back system be the same from all the manufactures?
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      04-22-2012, 02:55 AM   #11
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Let oneEighty do the headlights!
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      04-23-2012, 02:42 AM   #12
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The tips are too small. They need to be bigger.

The lights look horrible. You should tint the white line lights instead. Tinting the red lights just looks ghetto. Google tinted white lines. Hamann or Hartge or someone like that did it.

Good call to kill the Spoiler.
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      04-23-2012, 05:04 AM   #13
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I'm on a hunt for some white lines right now actually... I've had those in mind for his far for a while now, but the price tag on them is outrageous. LUCKLY, I found a source for white lines ranging in the price of $450ish

Since it's been almost a week, I'm starting to feel that the exhaust tips ARE too small, fawk. I'll get him to swap em out in a few months once his excitement tames a bit lol
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      04-23-2012, 07:25 PM   #14
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diff looks sexy! def get rid of the taillight tint or get whitelines. also, get bigger tips too.
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      04-23-2012, 11:21 PM   #15
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Just picked up a pair of white lines
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      04-24-2012, 02:12 AM   #16
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Quote:
Originally Posted by X-Vert View Post
Just picked up a pair of white lines
Was it used or brand NEW! $450 seems very resonable Price. Do u mind I ask u where u god the whiteline's.
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      04-24-2012, 01:10 PM   #17
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very nice..not sure y BMW went the box muffler tip route...QUADS ALL DAY!
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      04-24-2012, 03:02 PM   #18
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do you want to sell your 550 muffler with tips? let me know if yes
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      07-25-2012, 01:05 PM   #19
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550i with M5 diffuser

Quote:
Originally Posted by Igor@ONEighty View Post
I was itching to mess around with my shops neighbors 2012 550xi. I hated what he had going on with his rear end so I'm slowly revising it with my own twist, even though he was against every idea, he's slowly loving the out come

Anyway... I ordered the F10 M5 diffuser from getbmwparts.com. Once it arrived, I had it painted AW, and went ahead to test if it... figured it would be a direct swap, I was wrong. In order to fit the M5 diffuser, it was either modify the stock tips and shift them a few inches, or pick up Quad Tips and get em installed.

I was hoping the m5 diffuser was a direct swap for the 550i too.. Anyone know how much modification would be needed to make this setup work with stock 550i tips?
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      07-26-2012, 05:36 AM   #20
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Quote:
Originally Posted by EV0LVE View Post
Good call on the tail lights, it needs to be lighter with a shade of red perhaps. Black tails are so played out.

Cheers!
+1 on the tail light change as they looked a little backyard and bogan imo.
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