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      03-20-2013, 10:46 PM   #1
Stuart@BMRAutowerkes
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1M Exhaust on my 135i - Completed!! BMR + Advan

Hi all,

ever since I got my 135 I have always wanted a quad exhaust... initial searches led me to the Arqray exhaust and 3DDesign diffuser combo and whilst exquisitely made and crafted, it was exquisitely expensive.
The other option was to have the muffler on one side (ala factory) and run a pipe over to the other side for the two tips to poke out... I was tempted to do this but decided against it.

Fast forward 12 months into ownership and I'm chatting with Pete at Advan and he reckons the 1M muffler will fit the 135 with some mods. Whilst excited, am sceptical about the old codger's claims but decide to go out on a limb anyway and purchase the bits and pieces necessary. When doing the numbers the estimated cost seemed like excellent value. A few months wait as I collected what was needed and researched parts needed and then at the dyno day last Sat it was my first time seeing the car with quads all done and dusted - boy was I happy

The parts list isn't too extensive:

- 1M Bootfloor (OEM)
- 1M Heatshield (OEM)
- Quad diffuser of your choice (I went with the outer quads rather than inner quads like an M3)
- Exhaust of your choosing... currently I have an OEM 1M exhaust on, but now I know it fits I can choose any aftermarket 1M exhaust

And then the labour component/s:
- Take out old boot floor
- Relocate battery
- Fit new bootfloor
- Weld new custom exhaust hangers (old ones don't work)
- Align tips with diffuser

Some pics of the work in progress:

Chris's (excellent) welds as the tips have to be moved out ~60mm to accomodate the diffuser... a diffuser with openings approx 60mm in would negate the need for this (and save you chopping up the muffler):


Bolts up neatly to OEM N54 mids


Exhaust in place! Fitting nice and snug with new OEM 1M bootfloor. No tips yet


and.....

.
.
.
.
.

the finished product!!




More photos to come, particularly as I have a new boot to go on

Pete @ Advan is more than happy to perform the labour on this and given mine was the guinea pig, subsequent 1M exhaust conversions will be able to be completed much faster

I am happy to supply parts (and/or part numbers if you wish to source yourself)

Pricing on this is 99% finalised:

1. Parts + Labour + excluding exhaust so you can choose your own: $1,890
2. Parts + Labour + new 1M OEM exhaust: $2,990


Frankly I think option 1 is better - choose an aftermarket 1M exhaust or pickup a second hand unit as people swap out for aftermarket (saw one on eBay for $500)

For any more info, please email me or call Pete on (02) 9648 3366.

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      03-20-2013, 10:50 PM   #2
ilikebmxbikes
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Wow- exhaust looks rad.

I put a 1M exhaust on my 135i about 3 weeks ago. I did it will all OEM 1M parts. It came out to a little over $600 for the OEM parts (heat shielding, battery tray, battery cables, new exhaust hangar bushings and rear bumper support bar.) of course you have to factor in the cost of the exhaust unit and have a custom diffuser fabricated.

Your exhaust looks great and that is a good idea to cut the pipes to fit an exhausting quad diffuser.
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      03-20-2013, 10:50 PM   #3
DR-JEKL
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This sounded quite good for a 'oem' system on the dyno also!
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      03-20-2013, 10:52 PM   #4
ULOOKN
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Nice work!
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      03-20-2013, 11:12 PM   #5
GJA003
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Awesome work need a sound clip
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      03-20-2013, 11:16 PM   #6
Zuzu
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Saw Stu's car at the Advan Dyno day, and must say it deffinately looked OEM..

Great job to the Advan team.
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      03-20-2013, 11:29 PM   #7
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If anyone is after a stock 1M exhaust, call Andrew at Southern BM in Vic, I saw a few dead systems sitting out the back of his shed a few weeks back mine would be there too.... somewhere.


edit: Credit Stu, yours is a great setup mate, should have been the same as the 335i IMHO, from the factory!
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      03-20-2013, 11:59 PM   #8
ippykaye
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Looks great Stu! I'm a big fan of the quads and eventually gave up on doing the homework.

What diffuser is that Stu?
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      03-21-2013, 12:03 AM   #9
Eddie135
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Nice one Stu...

Not sure if there's anyone who tried this in melbourne yet. If there is a lcoal shop here to do it, I go for it.

+1
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      03-21-2013, 12:06 AM   #10
Stuart@BMRAutowerkes
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Quote:
Originally Posted by ippykaye View Post
Looks great Stu! I'm a big fan of the quads and eventually gave up on doing the homework.

What diffuser is that Stu?
Unbranded as of yet... fitment is pretty good on it though!!
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      03-21-2013, 12:41 AM   #11
dan_brooks
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Man this looks awesome...

How's the 1M axleback sound compared to 135?
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      03-21-2013, 12:47 AM   #12
1SER135
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Stu PLEASE PLEASE PLEASE do a Sound/Video Clip.

Also, was there any moving of the evap canister required?
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      03-21-2013, 01:02 AM   #13
Stuart@BMRAutowerkes
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Quote:
Originally Posted by GJA003 View Post
Awesome work need a sound clip
Quote:
Originally Posted by dan_brooks View Post
Man this looks awesome...

How's the 1M axleback sound compared to 135?
Quote:
Originally Posted by 1SER135 View Post
Stu PLEASE PLEASE PLEASE do a Sound/Video Clip.

Also, was there any moving of the evap canister required?
Not 100% satisfied with the sound just yet... needs just a little extra something.
It's definitely deeper, but I haven't heard it from outside the car yet (if you know what I mean - so it's hard to tell!)

I've got DPs as well so that makes the sound a bit 'dirtier' whether a good thing or bad thing.

I'll try do a sound clip, will need to borrow some half decent equipment or something.

Not sure if the evap canister was moved, will ask Chris or wait for Pete to chime in!

Last edited by Stuart@BMRAutowerkes; 03-21-2013 at 01:08 AM..
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      03-21-2013, 01:03 AM   #14
flinchy
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so you didn't need things like the fuel tank breather and stuff?.. well and obviously the battery cable extensions

ED:

Fuel system parts:
Vent Pipe 16137845193
Vent Pipe 16137845195
Exhaust steam pipe with dust filter 16137845194

what about those parts?

and

"- Weld new custom exhaust hangers (old ones don't work)" OEM support bar and hangers wouldn't be easier/cheaper?
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      03-21-2013, 01:10 AM   #15
Stuart@BMRAutowerkes
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Quote:
Originally Posted by flinchy View Post
so you didn't need things like the fuel tank breather and stuff?.. well and obviously the battery cable extensions

ED:

Fuel system parts:
Vent Pipe 16137845193
Vent Pipe 16137845195
Exhaust steam pipe with dust filter 16137845194

what about those parts?

and

"- Weld new custom exhaust hangers (old ones don't work)" OEM support bar and hangers wouldn't be easier/cheaper?
No I don't think those parts were used or required

Not sure if OEM support bar and hangers would be easier or cheaper, it seemed easy enough for chris to weld a piece of metal onto the exhaust and then insert it into some sort of rubber hanger.
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      03-21-2013, 01:41 AM   #16
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Quote:
Originally Posted by Stuart@BMRAutowerkes View Post


^
FTW
Looks awesome, OEM and how it should have been from the factory.
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      03-21-2013, 01:52 AM   #17
pcockley
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Tbh stu I was very suss when Pete mentioned you were doing this, but it does look the goods. IMO looks better than the quad pipes on an m3 by far
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      03-21-2013, 02:01 AM   #18
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Looks awesome.

Any extra hp over the stock setup?
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      03-21-2013, 02:58 AM   #19
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Quote:
Originally Posted by pcockley View Post
..........IMO looks better than the quad pipes on an m3 by far
What? How does this have anything to do with M3s, different user name same stuff.
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      03-21-2013, 03:05 AM   #20
pcockley
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Quote:
Originally Posted by Alpine*
Quote:
Originally Posted by pcockley View Post
..........IMO looks better than the quad pipes on an m3 by far
What? How does this have anything to do with M3s, different user name same stuff.
What's your point :
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      03-21-2013, 03:14 AM   #21
robbieredknapped
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Great looking exhaust Stu
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      03-21-2013, 03:17 AM   #22
flinchy
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Quote:
Originally Posted by Stuart@BMRAutowerkes View Post
No I don't think those parts were used or required

Not sure if OEM support bar and hangers would be easier or cheaper, it seemed easy enough for chris to weld a piece of metal onto the exhaust and then insert it into some sort of rubber hanger.
hm fair enough - if it's easier, cheaper and just as good, obvious choice lol

the other big thread on it and the people doing it WERE mostly in the US (LHD) and weren't sure if it was needed for RHD

Quote:
Originally Posted by ilikebmxbikes View Post
Wow- exhaust looks rad.

I put a 1M exhaust on my 135i about 3 weeks ago. I did it will all OEM 1M parts. It came out to a little over $600 for the OEM parts (heat shielding, battery tray, battery cables, new exhaust hangar bushings and rear bumper support bar.) of course you have to factor in the cost of the exhaust unit and have a custom diffuser fabricated.

Your exhaust looks great and that is a good idea to cut the pipes to fit an exhausting quad diffuser.
did it need any of the 'fuel system' stuff? or just the tray/cables/mounting and other 'obvious' stuff?
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