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      10-14-2014, 06:41 PM   #1
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Question 428i to 435i Exhaust Conversion?

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I have a 428i and some of us will definitely agree any -28i one sided exhaust is just a no no. Therefore I'm looking at getting the M Performance diffuser alongside the M Performance exhaust. Both being the 435i version because I want the dual exhaust setup. Now the real question, can this conversion be done? I've seen several posters get it done but I need more information on how it can be done, how long it should take, and what extra parts if any would I need? Also if any Southern California people know which reputable place would be able to do this without a problem? I've already contacted a few shops and they said they were unsure. Any helpful information would be great, thanks
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      10-15-2014, 12:08 AM   #2
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Quote:
Originally Posted by PCR0303
I have a 428i and some of us will definitely agree any -28i one sided exhaust is just a no no. Therefore I'm looking at getting the M Performance diffuser alongside the M Performance exhaust. Both being the 435i version because I want the dual exhaust setup. Now the real question, can this conversion be done? I've seen several posters get it done but I need more information on how it can be done, how long it should take, and what extra parts if any would I need? Also if any Southern California people know which reputable place would be able to do this without a problem? I've already contacted a few shops and they said they were unsure. Any helpful information would be great, thanks
I also have a 428 n it would be great if that conversion could be possible
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      10-15-2014, 09:06 AM   #3
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Quote:
Originally Posted by PCR0303 View Post
I have a 428i and some of us will definitely agree any -28i one sided exhaust is just a no no. Therefore I'm looking at getting the M Performance diffuser alongside the M Performance exhaust. Both being the 435i version because I want the dual exhaust setup. Now the real question, can this conversion be done? I've seen several posters get it done but I need more information on how it can be done, how long it should take, and what extra parts if any would I need? Also if any Southern California people know which reputable place would be able to do this without a problem? I've already contacted a few shops and they said they were unsure. Any helpful information would be great, thanks
check out this thread:
http://f30.bimmerpost.com/forums/sho...d.php?t=930613

many in there have reported doing it.
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      10-15-2014, 12:48 PM   #4
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I did the conversion on my 428, using a 335 muffler. Cut the old one off, and clamp/weld the new one on.
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      10-15-2014, 12:55 PM   #5
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Quote:
Originally Posted by exclusivo View Post
I did the conversion on my 428, using a 335 muffler. Cut the old one off, and clamp/weld the new one on.
I just had my 335i take-off exhaust delivered. Any pictures of your car post installation?

Where is valve that everyone is leaving unplugged?

Thanks!
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      10-15-2014, 01:28 PM   #6
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Hey, i got this done on my 428i M-sport.

First, I bought a 435i OEM diffuser (Part # 51128054564) and then, I bought a used OEM 335i muffler. I went to Kings Muffler in Van Nuys, CA (http://m.yelp.com/biz/king-muffler-van-nuys) and there was some trimming to do but it all worked out perfectly.

What's good about the OEM muffler is that it has the valve connector so you could control the loudness of the exhaust. If you would like something louder, I have some custom partial-straight pipes (muffler delete) that would fit a 428i flawlessly and it's a dual pipe setup, like a 435i.

I will post some pictures when I get home.
Hope this helped.
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      10-15-2014, 03:44 PM   #7
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Quote:
Originally Posted by exclusivo View Post
I did the conversion on my 428, using a 335 muffler. Cut the old one off, and clamp/weld the new one on.
Would love to see some pictures. Are you using the 435 OEM diffuser? and where to get this clamp from? thanks
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      10-15-2014, 03:44 PM   #8
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Quote:
Originally Posted by MattTheCarNut View Post
I just had my 335i take-off exhaust delivered. Any pictures of your car post installation?

Where is valve that everyone is leaving unplugged?

Thanks!
No pics, it looks like a 435. there are some detailed pics and info in the thread mentioned above.

There is a plug connected to your stock exhaust behind the left tip, this will also connect to a port (little black box looking thing) on the left tip of the 335/435 muffler. It controls an electronic flap in the tail pipe that opens/closes it. Unplug it to keep the flap constantly open for a more aggresive sound. Its the only wire connected to the muffler, so you cant miss it.
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      10-15-2014, 03:48 PM   #9
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Quote:
Originally Posted by DavidRbibo View Post
Hey, i got this done on my 428i M-sport.

First, I bought a 435i OEM diffuser (Part # 51128054564) and then, I bought a used OEM 335i muffler. I went to Kings Muffler in Van Nuys, CA (http://m.yelp.com/biz/king-muffler-van-nuys) and there was some trimming to do but it all worked out perfectly.

What's good about the OEM muffler is that it has the valve connector so you could control the loudness of the exhaust. If you would like something louder, I have some custom partial-straight pipes (muffler delete) that would fit a 428i flawlessly and it's a dual pipe setup, like a 435i.

I will post some pictures when I get home.
Hope this helped.
Pictures would be great. Since it worked out using OEM 435i diffuser, there should be no problem/difference in fitment if i were to use the M performance diffuser and exhaust? You could also show/tell me more about your custom dual pipe setup. why didn't you go with that setup? thanks!
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      10-15-2014, 03:48 PM   #10
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Quote:
Originally Posted by PCR0303 View Post
Would love to see some pictures. Are you using the 435 OEM diffuser? and where to get this clamp from? thanks
I'll post some once I get home but there is really not much to see lol. It looks exactly like a 435 would. I am using the performance diffuser with the finned midsection, picked up for for 200 on ebay, got the muffler for 100 from someone local on the forums. muffler shop charged 70 for the labor. I plan on getting larger tips put on, maybe a 3.5 or 4 inch tip
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      10-15-2014, 04:33 PM   #11
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Quote:
Originally Posted by exclusivo View Post
I'll post some once I get home but there is really not much to see lol. It looks exactly like a 435 would. I am using the performance diffuser with the finned midsection, picked up for for 200 on ebay, got the muffler for 100 from someone local on the forums. muffler shop charged 70 for the labor. I plan on getting larger tips put on, maybe a 3.5 or 4 inch tip
Thanks for the info regarding the plug. Looks like I'd leave it unplugged! Sounds like you scored on the M-Performance diffuser! Was it OEM? The cheapest I've seen is $400.
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      10-15-2014, 05:20 PM   #12
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why not just go 435i?
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      10-15-2014, 06:33 PM   #13
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Quote:
Originally Posted by MattTheCarNut View Post
Thanks for the info regarding the plug. Looks like I'd leave it unplugged! Sounds like you scored on the M-Performance diffuser! Was it OEM? The cheapest I've seen is $400.







You'll notice that my right tip is off center, some people say theirs lined up, some said they had to maneuver the muffler hangers, some say one tip sticks out further than the other...I decided to just leave it as is because I plan on changing the tips, so when the shop welds it, they can just cut it to fit.
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      10-15-2014, 06:37 PM   #14
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Quote:
Originally Posted by bill1718 View Post
why not just go 435i?
because I didn't want a 435, but I did however want dual exhaust.
I don't think anyone who does this mod wants to fool anyone into thinking they have a 435, if that's what you are trying to infer. Its mostly for the cosmetics and sound.
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      10-15-2014, 10:17 PM   #15
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Quote:
Originally Posted by PCR0303 View Post
Pictures would be great. Since it worked out using OEM 435i diffuser, there should be no problem/difference in fitment if i were to use the M performance diffuser and exhaust? You could also show/tell me more about your custom dual pipe setup. why didn't you go with that setup? thanks!
When using the OEM 435i or 335i Muffler (Same part and part number), you have to do some trimming if you want to get the tips straight and even, as exclusivo has shown in his photos.

The reason I didn't keep my other system is because it was a little too loud for my taste. Have that one sitting in the garage.

I have attached some pictures of my setup, the first is with the chrome tips and the second is with the black chrome tips (OEM).
Attached Images
  
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      10-16-2014, 01:47 AM   #16
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Quote:
Originally Posted by exclusivo View Post
because I didn't want a 435, but I did however want dual exhaust.
I don't think anyone who does this mod wants to fool anyone into thinking they have a 435, if that's what you are trying to infer. Its mostly for the cosmetics and sound.
Agreed. Your car looks stunning btw! Pretty much what I'm aiming for
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      10-16-2014, 01:52 AM   #17
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Quote:
Originally Posted by DavidRbibo View Post
When using the OEM 435i or 335i Muffler (Same part and part number), you have to do some trimming if you want to get the tips straight and even, as exclusivo has shown in his photos.

The reason I didn't keep my other system is because it was a little too loud for my taste. Have that one sitting in the garage.

I have attached some pictures of my setup, the first is with the chrome tips and the second is with the black chrome tips (OEM).
Beautiful car, looks great the way it turned out. I will def give that shop a try. I would say loud is good but I guess it depends. Did it drone? Since I'm not sure how it would sound I might just stick with the MPE. But after seeing yours and exclusivo's conversion, I can't wait to get mine done as well
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      10-16-2014, 02:46 AM   #18
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Been running the 335i MPE since spring, and I love it. It really makes a great impact on the sound and even more so in the Sport-modes. The biggest thrill is the small performance gain at higher speeds that I would say is thanks to the better flow you get. Pulls noticeably harder in speeds above 80 mph.
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      10-16-2014, 08:42 AM   #19
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Quote:
Originally Posted by Vitoco View Post
Been running the 335i MPE since spring, and I love it. It really makes a great impact on the sound and even more so in the Sport-modes. The biggest thrill is the small performance gain at higher speeds that I would say is thanks to the better flow you get. Pulls noticeably harder in speeds above 80 mph.
Ive wanted to hear the 335 MPE on an n20 have any videos?
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      10-16-2014, 02:46 PM   #20
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Thanks for the pictures, guys. I'm SO excited to get this done to my car. Just ordered my M-Performance diffuser. WOOT!
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      10-16-2014, 02:48 PM   #21
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Quote:
Originally Posted by DavidRbibo View Post
When using the OEM 435i or 335i Muffler (Same part and part number), you have to do some trimming if you want to get the tips straight and even, as exclusivo has shown in his photos.

The reason I didn't keep my other system is because it was a little too loud for my taste. Have that one sitting in the garage.

I have attached some pictures of my setup, the first is with the chrome tips and the second is with the black chrome tips (OEM).
What trimming does one have to do? On the exhaust end or the tip end? Can one just simply adjust the tips? I'm really OCD and would notice if the tips stick out too far or are off center.

Thanks,

Matt
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      10-17-2014, 02:21 AM   #22
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Look in the other thread about this conversion, it's in this section.
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