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

Nate@IND · 11-28-2011, 01:59 PM

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.

RaptorKTM · 11-28-2011, 02:06 PM

Can not wait, the system is just amazing. Now for the WHP gains.

MusclezMarinara · 11-28-2011, 02:27 PM

quality!

quanto?

MrRoboto · 11-28-2011, 02:58 PM

I wonder what improvement in sound and performance one would see with just the downpipes?

BMW Gator · 11-28-2011, 03:02 PM

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. $$

Powerbeast · 11-28-2011, 03:03 PM

Wow nice

Snertz · 11-28-2011, 04:34 PM

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.

Mr.Metak2you · 11-28-2011, 04:49 PM

Everything they make is like a work of art!

EIN M · 11-28-2011, 08:52 PM

Quote:

Originally Posted by Nate@IND

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?

PHANTOM · 11-28-2011, 10:41 PM

I hate to sound ignorant but what exactly is the benefit of changing out downpipes? And how involved is the install on the 1M?

duvinclunk · 11-28-2011, 10:48 PM

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?

ezeedee · 11-28-2011, 11:03 PM

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.

BMW Gator · 11-28-2011, 11:19 PM

Quote:

Originally Posted by ezeedee

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.

ezeedee · 11-28-2011, 11:29 PM

Quote:

Originally Posted by BMW Gator

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.

Powerbeast · 11-28-2011, 11:40 PM

You wouldn't happen to have the full eve system with down pipe in stock, would you?

RaptorKTM · 11-28-2011, 11:40 PM

this system makes me wet

HP Autowerks · 11-29-2011, 01:15 AM

Quote:

Originally Posted by duvinclunk

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.

l888apex · 11-29-2011, 01:32 AM

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!

the infamous... · 11-29-2011, 01:36 AM

this's str8 up dp porn :fapfapfapfap:

BMW Gator · 11-29-2011, 08:14 AM

Quote:

Originally Posted by HP Autowerks

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

fastauto · 11-29-2011, 10:52 AM

Quote:

Originally Posted by BMW Gator

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?

ezeedee · 11-29-2011, 11:23 AM

Quote:

Originally Posted by fastauto

+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.

11-28-2011, 01:59 PM	#1
Nate@IND Drives: BMW Join Date: Oct 2006 Location: Chicago Posts: 8,735 iTrader: (16)	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. __________________ IND DISTRIBUTION \| 866.963.4520 \| IND STYLE \| EISENMANN BLOG
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11-28-2011, 04:49 PM	#8
Mr.Metak2you Brigadier General Drives: LEXUS LS(DailyDriver) Join Date: Nov 2007 Location: Astral Projecting: ∞ 23.516 -122 02.625 0242.101 ĕv'rē-hwâr' Posts: 4,382 iTrader: (11) Garage List 2013 BMW M3 [0.00] 2011 1M Coupe (Sold) [4.30] 2008 E90 M3 (Sold) [4.30] 2007 Z4 Mcpe (Sold) [5.00] 2005 BMW M3 (Sold) [5.00]	Everything they make is like a work of art! __________________

11-29-2011, 01:36 AM	#19
the infamous... Lieutenant General Drives: like I'M BOUT THAT LIFE Join Date: Jul 2008 Location: PARADISE aka DAWNTOWN Posts: 16,890 iTrader: (0)	this's str8 up dp porn :fapfapfapfap: __________________ "simple is clean" -The ///ModFather [ iND ] - [ eAs ] - [ ACM ] - [ LTMW ] - [ AA ]

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11-28-2011, 02:06 PM	#2
RaptorKTM Colonel Drives: 1 M Coupe Join Date: Apr 2006 Location: San Diego Posts: 2,366 iTrader: (1) Garage List 2011 BMW 1 M [0.00]	Can not wait, the system is just amazing. Now for the WHP gains.

11-28-2011, 02:27 PM	#3
MusclezMarinara Banned Drives: VALNCYA Join Date: Jan 2009 Location: Jersey Posts: 5,026 iTrader: (23) Garage List 2011 BMW 1M [5.00] 2009 335i Sedan xdrive [4.67]	quality! quanto?

11-28-2011, 02:58 PM	#4
MrRoboto Colonel Drives: VO 1M Join Date: Aug 2007 Location: Canada Posts: 2,600 iTrader: (0)	I wonder what improvement in sound and performance one would see with just the downpipes?

11-28-2011, 03:02 PM	#5
BMW Gator Private First Class Drives: 1M/e90/GTS/Rubicon/FJ40/+ Join Date: Apr 2010 Location: Florida Posts: 164 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. $$

11-28-2011, 03:03 PM	#6
Powerbeast Major General Drives: E90 M3 Dakar Yellow Join Date: Mar 2009 Location: SoCal Posts: 5,393 iTrader: (4)	Wow nice

11-28-2011, 04:34 PM	#7
Snertz H O O N Drives: ein M?! Join Date: Oct 2008 Location: NY Posts: 512 iTrader: (7)	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.

11-28-2011, 10:41 PM	#10
PHANTOM Private First Class Drives: 1M, X5d Join Date: Oct 2011 Location: Palm Beach Posts: 145 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?

11-28-2011, 10:48 PM	#11
duvinclunk Private First Class Drives: 02 M3 Join Date: Aug 2010 Location: SLC, UT Posts: 130 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?

11-28-2011, 11:03 PM	#12
ezeedee NCOIC of Kickin It Drives: 08 135i "Simona" Join Date: Feb 2011 Location: Great Falls MT Posts: 941 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.

11-28-2011, 11:40 PM	#15
Powerbeast Major General Drives: E90 M3 Dakar Yellow Join Date: Mar 2009 Location: SoCal Posts: 5,393 iTrader: (4)	You wouldn't happen to have the full eve system with down pipe in stock, would you?

11-29-2011, 01:32 AM	#18
l888apex Second Lieutenant Drives: #30/740 BSM 1M Join Date: Mar 2011 Location: Ashburn Posts: 210 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!