135i Exhaust Diagram

Hind · 11-20-2009, 10:29 PM

Here is the 135i Stock Exhaust system I pieced together credit from RealOEM.com. Just for reference purposes.

Not to Scale

jibaholic101 · 11-20-2009, 11:50 PM

restrictive design....

GtiGyver · 11-20-2009, 11:50 PM

Why is it that none of the aftermarket downpipes have flexpipes as the OEM units do?

Lloyd · 11-21-2009, 12:35 AM

it doesn't seem scaled correctly, correct me if i'm wrong

Hind · 11-21-2009, 12:43 AM

I would ignore the size, I just made it to show the pieces.

Robert · 11-21-2009, 01:40 AM

sweet.

escobar929 · 11-21-2009, 07:10 AM

can be useful, thanks

Slay0r · 11-23-2009, 10:51 AM

yeh, that can't be proportionally correct. If that was the case we would HAVE to get a full cat-back exhaust system. those pipes look tiny

BimmerSchnitzel · 11-24-2009, 09:13 PM

I'm guessing those are the catalytic converters in the down pipes and the resonator where it goes 2 into 1, but what are those bulges in between the DPs and what I think is the resonator??

BimmerSchnitzel · 11-24-2009, 09:21 PM

Quote:

Originally Posted by rbernard1984

It's a huge design flaw that I've mentioned many times on other threads. There are a few high end companies such as supersprint and RDsport that retain the OEM flexibility but thats about it. When you remove the flexibility from the system, with a solid DP, other parts will have to absorb that movement (worst case scenario is that your turbo housings crack, which is very expensive). All the DP manufactures on here claim that there is no harm, but we have yet to see any long term result from running DPs. It could very well be that the OEM system is overly cautious and that solid downpipes will have little effect on a system over the average life of a car, but I'm willing to put my money on the BMW engineers having a better idea about stress loads then a few small tuners.

The classic quote from tuners in the Subaru community regarding flex joints is simply "They will fail at some point". Granted that is a load of shit and a good scare tactic at best, there where many subie people putting uppipes in their cars w/o a flex joint with no ill effects. On the 135i who knows but I sure as hell would not chance it. At least on the WRX a non-flex uppipe moves with the engine but on this car it seems as though there is no uppipe so thats not an issue however since the engine is mounted independently of the exhaust, the DPs may be a problem if there is no flex section...

11-20-2009, 10:29 PM	#1
Hind ///Mmmm 78 Rep 796 Posts Drives: '09 BMW 135i Join Date: Jun 2008 Location: Tampa, FL iTrader: (4) Garage List 2011 BMW 335i LCI [0.00]	135i Exhaust Diagram Here is the 135i Stock Exhaust system I pieced together credit from RealOEM.com. Just for reference purposes. Not to Scale __________________ Current: E90 LCI 335i JetBlack - BMS OCC, JB4 w/ E85, ETS Charge Pipe, Vishnu Catted DP Retired:///E82 135i LeMans - 12.710 @ 108 MPH Riss Racing OCC, Shadowline Grills, Magnaflow Axle-Back, JB4, ETS FMIC, BMS DCI, BMW Perf Sideskirts, BMS 12/10 Spacers, E93 Front Sway PDC Flickr YouTube Last edited by Hind; 11-23-2009 at 11:11 AM..
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11-20-2009, 11:50 PM	#2
jibaholic101 Brigadier General 158 Rep 3,496 Posts Drives: women wild Join Date: Nov 2008 Location: Charleston, SC iTrader: (0)	restrictive design.... __________________ some italian, german, and japanese ones; and on order more of the same
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11-20-2009, 11:50 PM	#3
GtiGyver Lieutenant 69 Rep 460 Posts Drives: 2009 Space Grey E90 328i MT Join Date: Jun 2009 Location: Montreal iTrader: (3)	Why is it that none of the aftermarket downpipes have flexpipes as the OEM units do?
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11-21-2009, 12:35 AM	#4
Lloyd Networking Geek 24 Rep 334 Posts Drives: 2014 Subaru STi 5dr Join Date: Apr 2008 Location: Pembroke Pines, FL iTrader: (2) Garage List 2016 Lexus IS350 [0.00]	it doesn't seem scaled correctly, correct me if i'm wrong __________________
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11-21-2009, 12:43 AM	#5
Hind ///Mmmm 78 Rep 796 Posts Drives: '09 BMW 135i Join Date: Jun 2008 Location: Tampa, FL iTrader: (4) Garage List 2011 BMW 335i LCI [0.00]	I would ignore the size, I just made it to show the pieces. __________________ Current: E90 LCI 335i JetBlack - BMS OCC, JB4 w/ E85, ETS Charge Pipe, Vishnu Catted DP Retired:///E82 135i LeMans - 12.710 @ 108 MPH Riss Racing OCC, Shadowline Grills, Magnaflow Axle-Back, JB4, ETS FMIC, BMS DCI, BMW Perf Sideskirts, BMS 12/10 Spacers, E93 Front Sway PDC Flickr YouTube
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11-21-2009, 01:40 AM	#6
Robert Major General 414 Rep 6,968 Posts Drives: 135i -> is350 -> Tesla M3 perf Join Date: Aug 2005 Location: Socal iTrader: (1)	sweet.
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11-21-2009, 07:10 AM	#7
escobar929 Brigadier General 154 Rep 4,528 Posts Drives: M2 CS Join Date: Aug 2009 Location: Hollywood, FL iTrader: (14) Garage List 2020 M2 CS [10.00] 2020 M240i [0.00]	can be useful, thanks
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11-23-2009, 10:51 AM	#8
Slay0r First Lieutenant 19 Rep 337 Posts Drives: 08 135i, 08 E92 ///M,13 535i Join Date: Dec 2008 Location: Louisiana iTrader: (0)	yeh, that can't be proportionally correct. If that was the case we would HAVE to get a full cat-back exhaust system. those pipes look tiny
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11-24-2009, 09:13 PM	#9
BimmerSchnitzel J1V3.455.7URCK3Y 7 Rep 134 Posts Drives: 2008 SGM 135i Join Date: Sep 2009 Location: St. Louis, MO iTrader: (0)	I'm guessing those are the catalytic converters in the down pipes and the resonator where it goes 2 into 1, but what are those bulges in between the DPs and what I think is the resonator??
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