BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      11-28-2011, 01:59 PM   #1
Nate@IND
471

 
Nate@IND's Avatar
 
Drives: BMW
Join Date: Oct 2006
Location: Chicago


Posts: 10,423
iTrader: (19)

Akrapovic E82 1M Downpipes

Akrapovic's new 1M downpipe is one of their most thoroughly developed pieces to date. The ends of the downpipe are cast in stainless steel to allow the best possible exhaust flow, the flex bellows in the downpipe ensure that the exhaust system can move safely without damaging the turbochargers, and reinforced brackets will last for years. O2 sensor bungs are positioned in the factory locations for easy install.





















__________________
Appreciate 0
      11-28-2011, 02:06 PM   #2
RaptorKTM
Colonel
United_States
69

 
RaptorKTM's Avatar
 
Drives: 1 M Coupe
Join Date: Apr 2006
Location: San Diego


Posts: 2,367
iTrader: (1)

Garage List
2011 BMW 1 M  [0.00]
Can not wait, the system is just amazing. Now for the WHP gains.
Appreciate 0
      11-28-2011, 02:27 PM   #3
MusclezMarinara
Banned
United_States
79

 
Drives: VALNCYA
Join Date: Jan 2009
Location: Jersey


Posts: 5,022
iTrader: (23)

Garage List
quality!

quanto?
Appreciate 0
      11-28-2011, 02:58 PM   #4
MrRoboto
Colonel
Canada
53

 
Drives: VO 1M
Join Date: Aug 2007
Location: Canada


Posts: 2,711
iTrader: (0)

I wonder what improvement in sound and performance one would see with just the downpipes?
Appreciate 0
      11-28-2011, 03:02 PM   #5
BMW Gator
Private First Class
5

 
BMW Gator's Avatar
 
Drives: 1M/ViperGTS/Rubicon/FJ40/+
Join Date: Apr 2010
Location: Florida


Posts: 169
iTrader: (0)

Impressed! Beautiful construction.

1. Dyno results would be nice to see when available.

2. Are these Akra's 2 1/2 inch while the A/R's are 3 inch?

3. $$
Appreciate 0
      11-28-2011, 03:03 PM   #6
Powerbeast
Major General
United_States
136

 
Powerbeast's Avatar
 
Drives: E90 M3 Dakar Yellow
Join Date: Mar 2009
Location: SoCal


Posts: 7,178
iTrader: (4)

Wow nice
Appreciate 0
      11-28-2011, 04:34 PM   #7
Snertz
H O O N
United_States
9

 
Snertz's Avatar
 
Drives: ein M?!
Join Date: Oct 2008
Location: NY


Posts: 572
iTrader: (9)

Send a message via AIM to Snertz Send a message via Skype™ to Snertz
Beautiful pieces as usual looks to be 2.5" from the bellmounths to the end, curious on how these compare to CP-E pipes as these look similar with exception to the flex joint and brackets.
__________________

U WOT M8?
Appreciate 0
      11-28-2011, 04:49 PM   #8
Mr.Metak2you
Brigadier General
117

 
Mr.Metak2you's Avatar
 
Drives: LEXUS LS(DailyDriver)
Join Date: Nov 2007
Location: Astral Projecting: ∞ 23.516 -122 02.625 0242.101 ĕv'rē-hwr'


Posts: 4,753
iTrader: (15)

Garage List
Everything they make is like a work of art!
__________________
Appreciate 0
      11-28-2011, 08:52 PM   #9
EIN M
Second Lieutenant
United_States
4

 
Drives: BMW 1M
Join Date: Oct 2011
Location: Dallas, TX


Posts: 280
iTrader: (0)

Quote:
Originally Posted by Nate@IND View Post
The ends of the downpipe are cast in stainless steel to allow the best possible exhaust flow
OK, so I'm a little confused.

a) How does the composition of the "ends of the downpipe" affect flow? Wouldn't the shape be the determining factor?

b) Does this mean that entire DP is not 100% SS?
Appreciate 0
      11-28-2011, 10:41 PM   #10
PHANTOM
Private First Class
7

 
Drives: 1M, X5d
Join Date: Oct 2011
Location: Palm Beach


Posts: 148
iTrader: (0)

I hate to sound ignorant but what exactly is the benefit of changing out downpipes? And how involved is the install on the 1M?
Appreciate 0
      11-28-2011, 10:48 PM   #11
duvinclunk
Second Lieutenant
2

 
duvinclunk's Avatar
 
Drives: On the search.
Join Date: Aug 2010
Location: SLC, UT


Posts: 262
iTrader: (0)

Curious to see this item. I have had some BAD experiences with vibration in the past with that type of flex section but interested in seeing it perform. Will these also fit the 135i's N54?
Appreciate 0
      11-28-2011, 11:03 PM   #12
ezeedee
NCOIC of Kickin It
Germany
17

 
ezeedee's Avatar
 
Drives: 08 135i "Simona"
Join Date: Feb 2011
Location: Great Falls MT


Posts: 947
iTrader: (1)

Garage List
2008 135i  [3.50]
im guessing since akrapovic did their dp's 2.5" all the way through, that all the other manufacturers wasted their time, materials, and valuable space, having a 3" pipe tapering to 2.5" at the outlet?

If I, for whatever reason, replaced my dp's, i would go with 2.5" pipes and heat wrap them.
Appreciate 0
      11-28-2011, 11:19 PM   #13
BMW Gator
Private First Class
5

 
BMW Gator's Avatar
 
Drives: 1M/ViperGTS/Rubicon/FJ40/+
Join Date: Apr 2010
Location: Florida


Posts: 169
iTrader: (0)

Quote:
Originally Posted by ezeedee View Post
im guessing since akrapovic did their dp's 2.5" all the way through, that all the other manufacturers wasted their time, materials, and valuable space, having a 3" pipe tapering to 2.5" at the outlet?

If I, for whatever reason, replaced my dp's, i would go with 2.5" pipes and heat wrap them.
We need some more research and dynos! - I have heard that the smaller pipe keeps higher exhaust velocity vs larger pipes which allow more volume? I don't know which is superior? Would love to see a head to head comparo.
Appreciate 0
      11-28-2011, 11:29 PM   #14
ezeedee
NCOIC of Kickin It
Germany
17

 
ezeedee's Avatar
 
Drives: 08 135i "Simona"
Join Date: Feb 2011
Location: Great Falls MT


Posts: 947
iTrader: (1)

Garage List
2008 135i  [3.50]
Quote:
Originally Posted by BMW Gator View Post
We need some more research and dynos! - I have heard that the smaller pipe keeps higher exhaust velocity vs larger pipes which allow more volume? I don't know which is superior? Would love to see a head to head comparo.
hate to be the pessimist, but i dont think a comparo will happen until eurotuner or somebody does it. its a lot of money and a lot of work to even do 4 or 5 sets of pipes.
Appreciate 0
      11-28-2011, 11:40 PM   #15
Powerbeast
Major General
United_States
136

 
Powerbeast's Avatar
 
Drives: E90 M3 Dakar Yellow
Join Date: Mar 2009
Location: SoCal


Posts: 7,178
iTrader: (4)

You wouldn't happen to have the full eve system with down pipe in stock, would you?
Appreciate 0
      11-28-2011, 11:40 PM   #16
RaptorKTM
Colonel
United_States
69

 
RaptorKTM's Avatar
 
Drives: 1 M Coupe
Join Date: Apr 2006
Location: San Diego


Posts: 2,367
iTrader: (1)

Garage List
2011 BMW 1 M  [0.00]
this system makes me wet
Appreciate 0
      11-29-2011, 01:15 AM   #17
HP Autosport
United_States
406

 
Drives: F80 M3
Join Date: Mar 2007
Location: Santa Barbara, Brembo, GIAC, Koni, Ohlins, Performance Friction, Quaife, Stoptech, Vorshlag


Posts: 11,388
iTrader: (29)

Quote:
Originally Posted by duvinclunk View Post
Curious to see this item. I have had some BAD experiences with vibration in the past with that type of flex section but interested in seeing it perform. Will these also fit the 135i's N54?
Yes, all N54 135i 335i and 1M use the same DP's. AR designed versions have been installed on the 1M already.
Appreciate 0
      11-29-2011, 01:32 AM   #18
l888apex
Second Lieutenant
2

 
l888apex's Avatar
 
Drives: #30/740 BSM 1M
Join Date: Mar 2011
Location: Ashburn


Posts: 297
iTrader: (0)

I think that for relatively tame power levels (bolt ons/tune) the 2.5" should be sufficient. If you go to a 3" you will lose some low end torque/spool up but gain some deeper sound and possibly top end power depending on how restrictive the rest of the system is. It's all about the goals you want to achieve. All in all these are beautiful pieces!
Appreciate 0
      11-29-2011, 01:36 AM   #19
the infamous...
Relapsed Bimmerpost Addict
United_States
423

 
the infamous...'s Avatar
 
Drives: like I'M BOUT THAT LIFE
Join Date: Jul 2008
Location: PARADISE aka CANES COUNTRY


Posts: 17,534
iTrader: (0)

this's str8 up dp porn :fapfapfapfap:
__________________


"simple is clean" -The ///ModFather
Appreciate 0
      11-29-2011, 08:14 AM   #20
BMW Gator
Private First Class
5

 
BMW Gator's Avatar
 
Drives: 1M/ViperGTS/Rubicon/FJ40/+
Join Date: Apr 2010
Location: Florida


Posts: 169
iTrader: (0)

Quote:
Originally Posted by HP Autowerks View Post
Yes, all N54 135i 335i and 1M use the same DP's. AR designed versions have been installed on the 1M already.
Harold,
What is your opinion regarding 2 1/2" vs 3" DP's?
Thanks
Appreciate 0
      11-29-2011, 10:52 AM   #21
fastauto
Captain
United_States
9

 
fastauto's Avatar
 
Drives: AW 1M Coupe
Join Date: Dec 2009
Location: Long Island, NY


Posts: 630
iTrader: (0)

Quote:
Originally Posted by BMW Gator View Post
Harold,
What is your opinion regarding 2 1/2" vs 3" DP's?
Thanks
+1. I am new to the bmw world but have been having fun with turbo cars for a long while. I am shocked to see so many people not looking for a true 3" setup. Is it because the majority of people running these engines retain the stock turbos thus you dont need the larger plumbing?
Appreciate 0
      11-29-2011, 11:23 AM   #22
ezeedee
NCOIC of Kickin It
Germany
17

 
ezeedee's Avatar
 
Drives: 08 135i "Simona"
Join Date: Feb 2011
Location: Great Falls MT


Posts: 947
iTrader: (1)

Garage List
2008 135i  [3.50]
Quote:
Originally Posted by fastauto View Post
+1. I am new to the bmw world but have been having fun with turbo cars for a long while. I am shocked to see so many people not looking for a true 3" setup. Is it because the majority of people running these engines retain the stock turbos thus you dont need the larger plumbing?
I dont think anyone makes a true 3" do they? i havent shopped for dp's in a while, but i think anyone made a dp with a 3" outlet. i think the biggest issue would be mating it. fitting dual 3" mids, and, unless you put turndowns before the rear axle, the exhaust would bottleneck at the rear axle.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 08:30 AM.




1addicts
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST