Custom Exhaust on 2011 128i

ecompany07 · 08-19-2013, 07:31 PM

Hello,

Im new to the 1 series community. I just purchased a 2011 128i Black Completely stock. Planning on some modifications I want to ask how many have done a custom exhaust on a 128i? What is the stock size diameter of the 128i exhaust?

I've always done custom exhaust on other cars, i was thinking about a borla muffler like i used to have in my previous car?

Thanks!

631twentyeighteye · 08-19-2013, 08:23 PM

Most of us will simply go with the performance exhaust, as its extremely simple and provides AMAZING sound benefits without any drone or excessive noise, i would highly suggest looking into that. If thats too pricy for you, you can get a stock(or any) 135i axle back section, and cut your stock 128 mids and have it custom fitted to work with the 135i axleback. I've done this myself and ran a muffler delete that was incredibly loud and annoying albeit beautiful sounding, and now i run a stock 135i muffler that sounds just as great but much quieter than the straight pipe. The stock 135i axleback is louder than stock and sounds much nicer along with some nice exhaust pops.

JimD · 08-20-2013, 09:56 AM

I think the stock size of the pipe is 50mm but I'm working from memory. You should explore RealOEM for a reliable input. Also from memory, I think somebody found that the highest output n52 has 75mm pipe. That would be a pretty big change but is probably the largest you should consider. I don't think a larger exhaust by itself will raise your hp a lot but that in combination with the 3 stage inlet and reprogramming (a tune) should. The interesting thing is the X3/5 n52s are rated as high as 272hp. 40 hp more than we have should be quite noticable.

TheSt|G · 08-20-2013, 10:42 PM

BMW Performance exhaust is definitely the way to go. Roughly $600, perfect factory fitment, well made, and sounds fantastic.

Bimmer-Bob · 08-20-2013, 11:32 PM

Quote:

Originally Posted by TheSt|G

BMW Performance exhaust is definitely the way to go. Roughly $600, perfect factory fitment, well made, and sounds fantastic.

Exactly. In this case, BMW provides such an ideal solution that it just doesn't make much sense to go looking to the aftermarket for an alternative. The sound is absolutely perfect - OEM fitment and quality is just the icing on the cake.

TheSt|G · 08-21-2013, 12:24 AM

Quote:

Originally Posted by Bimmer-Bob

Exactly. In this case, BMW provides such an ideal solution that it just doesn't make much sense to go looking to the aftermarket for an alternative. The sound is absolutely perfect - OEM fitment and quality is just the icing on the cake.

Especially when most of the other solutions require half assing it in some way or another.

jksgoh · 08-21-2013, 12:28 AM

+1 for the BMW perf exhaust

JimD · 08-21-2013, 03:33 PM

Isn't the BMW performance exhaust just a muffler? I accept it sounds good but replacing the muffler would not seem to make much if any difference in the performance. The BMW supplied pipe is not unreasonable in size for a 3 liter engine but it is not mandral bent so it is more restrictive than it needs to be. If the OP is looking for performance maybe he needs to consider a custom solution with larger mandral bent pipe or possibly the Magnaflow cat back. At least it's tubing appears to be mandral bent.

TheSt|G · 08-21-2013, 05:01 PM

Quote:

Originally Posted by JimD

Isn't the BMW performance exhaust just a muffler? I accept it sounds good but replacing the muffler would not seem to make much if any difference in the performance. The BMW supplied pipe is not unreasonable in size for a 3 liter engine but it is not mandral bent so it is more restrictive than it needs to be. If the OP is looking for performance maybe he needs to consider a custom solution with larger mandral bent pipe or possibly the Magnaflow cat back. At least it's tubing appears to be mandral bent.

OP doesn't seem to be interested in performance.

Mentioned a muffler and the phrase "custom exhaust". None of the mufflers make power on our car and "custom" just means no R&D in terms of exhaust.

Here we go though, for the benefit of the doubt:

http://www.supersprint.com/en/IT/pro...converter.aspx

KellyK · 08-22-2013, 01:20 PM

magnaflow also has an exhaust for 128i, i actually just received mine today and will be putting it on next week

Dafttt · 08-22-2013, 11:30 PM

Quote:

Originally Posted by KellyK

magnaflow also has an exhaust for 128i, i actually just received mine today and will be putting it on next week

...update us when you get a chance! Dying to hear how that sounds.

KellyK · 08-23-2013, 12:56 AM

Quote:

Originally Posted by Daft Auto

...update us when you get a chance! Dying to hear how that sounds.

will do! i think you parked next to me at 1fest lol!

Dafttt · 08-23-2013, 03:28 PM

Quote:

Originally Posted by KellyK

will do! i think you parked next to me at 1fest lol!

Coulda sworn I parked between two 135i's... Aw man I thought I met all the 128i owners there! We have some pretty similar cars minus your bumpers, I'm jelly.

Magnaflow is an axle-back right?

Billup · 08-24-2013, 09:23 PM

Quote:

Originally Posted by KellyK

magnaflow also has an exhaust for 128i, i actually just received mine today and will be putting it on next week

Post a sound clip if you don't mind. I was looking at this since its a full system, compared to BMW Perf exhaust is just an axle back.

Billup · 08-24-2013, 09:52 PM

Quote:

Originally Posted by Daft Auto

Coulda sworn I parked between two 135i's... Aw man I thought I met all the 128i owners there! We have some pretty similar cars minus your bumpers, I'm jelly.

Magnaflow is an axle-back right?

From what I've found its a cat back system. Perf is axle back. There was one other company I found that had a cat back system but was upwards of $1200.

Greenkirby21 · 08-24-2013, 11:04 PM

Quote:

Originally Posted by Billup

Post a sound clip if you don't mind. I was looking at this since its a full system, compared to BMW Perf exhaust is just an axle back.

http://www.1addicts.com/forums/showthread.php?t=530942

edit: I should probably make a better video. It sounds much better. I think I was using my iPhone 3g at the time...

Dafttt · 08-25-2013, 12:12 AM

^Ahh I see, thanks!

I think we need an exhaust media thread.

TheSt|G · 08-25-2013, 07:53 AM

Quote:

Originally Posted by Daft Auto

^Ahh I see, thanks!

I think we need an exhaust media thread.

This is a good idea.

KellyK · 08-25-2013, 10:49 PM

Quote:

Originally Posted by Daft Auto

Coulda sworn I parked between two 135i's... Aw man I thought I met all the 128i owners there! We have some pretty similar cars minus your bumpers, I'm jelly.

Magnaflow is an axle-back right?

catback! thank you by the way

the exhaust is going up tomorrow!

jksgoh · 08-26-2013, 07:55 PM

Quote:

Originally Posted by TheSt|G

This is a good idea.

Quote:

Originally Posted by Daft Auto

^Ahh I see, thanks!

I think we need an exhaust media thread.

Alright, then lets make one

08-19-2013, 07:31 PM	#1
ecompany07 Enlisted Member 8 Rep 48 Posts Drives: Fast Join Date: Nov 2012 Location: PR iTrader: (0)	Custom Exhaust on 2011 128i Hello, Im new to the 1 series community. I just purchased a 2011 128i Black Completely stock. Planning on some modifications I want to ask how many have done a custom exhaust on a 128i? What is the stock size diameter of the 128i exhaust? I've always done custom exhaust on other cars, i was thinking about a borla muffler like i used to have in my previous car? Thanks!
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08-19-2013, 08:23 PM	#2
631twentyeighteye Colonel 198 Rep 2,239 Posts Drives: 08 335i Join Date: Aug 2012 Location: Long island iTrader: (7)	Most of us will simply go with the performance exhaust, as its extremely simple and provides AMAZING sound benefits without any drone or excessive noise, i would highly suggest looking into that. If thats too pricy for you, you can get a stock(or any) 135i axle back section, and cut your stock 128 mids and have it custom fitted to work with the 135i axleback. I've done this myself and ran a muffler delete that was incredibly loud and annoying albeit beautiful sounding, and now i run a stock 135i muffler that sounds just as great but much quieter than the straight pipe. The stock 135i axleback is louder than stock and sounds much nicer along with some nice exhaust pops. __________________ 08 e93 335i MT
	Appreciate 0 Quote

08-20-2013, 09:56 AM	#3
JimD Brigadier General 368 Rep 3,547 Posts Drives: 128i convertible Join Date: Apr 2009 Location: Lexington, SC iTrader: (0)	I think the stock size of the pipe is 50mm but I'm working from memory. You should explore RealOEM for a reliable input. Also from memory, I think somebody found that the highest output n52 has 75mm pipe. That would be a pretty big change but is probably the largest you should consider. I don't think a larger exhaust by itself will raise your hp a lot but that in combination with the 3 stage inlet and reprogramming (a tune) should. The interesting thing is the X3/5 n52s are rated as high as 272hp. 40 hp more than we have should be quite noticable. __________________ 128i Convertible, MT, Alpine White, Black Top, Taupe Leatherette, Walnut, Sport Ordered 5/22/09, Completed 6/4/09, At Port 6/9/09, On the Georgia Highway 6/13/09, Ship Arrived Charleston 6/24/09 at 10pm, PCD 7/21/09
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08-20-2013, 10:42 PM	#4
TheSt\|G Resident Tamed Racing Driver 298 Rep 4,697 Posts Drives: 911, 130is, E39 M5, E36 M3 Join Date: Mar 2008 Location: Outside Philly iTrader: (2)	BMW Performance exhaust is definitely the way to go. Roughly $600, perfect factory fitment, well made, and sounds fantastic. __________________ 2005 E46 M3 Interlagos/Cinnamon with Sunroof Delete
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08-21-2013, 12:28 AM	#7
jksgoh Major 141 Rep 1,448 Posts Drives: M2 Join Date: Oct 2008 Location: Melb, Vic, Aus iTrader: (0) Garage List 2008 E82 125i [0.00]	+1 for the BMW perf exhaust
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08-21-2013, 03:33 PM	#8
JimD Brigadier General 368 Rep 3,547 Posts Drives: 128i convertible Join Date: Apr 2009 Location: Lexington, SC iTrader: (0)	Isn't the BMW performance exhaust just a muffler? I accept it sounds good but replacing the muffler would not seem to make much if any difference in the performance. The BMW supplied pipe is not unreasonable in size for a 3 liter engine but it is not mandral bent so it is more restrictive than it needs to be. If the OP is looking for performance maybe he needs to consider a custom solution with larger mandral bent pipe or possibly the Magnaflow cat back. At least it's tubing appears to be mandral bent. __________________ 128i Convertible, MT, Alpine White, Black Top, Taupe Leatherette, Walnut, Sport Ordered 5/22/09, Completed 6/4/09, At Port 6/9/09, On the Georgia Highway 6/13/09, Ship Arrived Charleston 6/24/09 at 10pm, PCD 7/21/09
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08-22-2013, 01:20 PM	#10
KellyK Lady Driven 50 Rep 279 Posts Drives: AW 2011 128i Join Date: May 2012 Location: Orange County iTrader: (0)	magnaflow also has an exhaust for 128i, i actually just received mine today and will be putting it on next week
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08-25-2013, 12:12 AM	#17
Dafttt Captain 33 Rep 691 Posts Drives: 128i 6MT Join Date: Jan 2012 Location: Malibu iTrader: (0)	^Ahh I see, thanks! I think we need an exhaust media thread.
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