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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > iCarbon N55 Downpipe Review



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      11-19-2010, 09:01 AM   #67
Pepe_pr
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Any Check Engine Ligth?? Codes?
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USED TO HAVE A 385 whp 479 tq N55 335 2011 (AT) AND NOW A 135 M package 2010 (AT) 447whp/504tq
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      11-19-2010, 02:35 PM   #68
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Here is the result when Berk Technology exhaust(with rear muffler) is added.

Green - Stock
Red - iCarbon Performance catless DP
Blue - The above with Berk Technology Exhaust added

Again, we picked up power everywhere. Max tq is 273.5 and hp is 269.7. In comparison without the Berk exhaust, max tq was 267.8 and hp is 260.7

In stock trim the 135i N55 made 254 tq and 251 hp

Remember this is on a SuperFlow dyno. Dynojet numbers will be higher.
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      11-19-2010, 04:35 PM   #69
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I'm liking this more and more!
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      11-19-2010, 05:18 PM   #70
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Quote:
Originally Posted by Pepe_pr View Post
Any Check Engine Ligth?? Codes?
pretty sure there is - that's why you need the CAN tool.
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      11-19-2010, 11:45 PM   #71
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Awesome, you should add that to the OP.
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      11-24-2010, 04:23 AM   #72
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Does this DP will 2011 N55 335xi?
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      11-24-2010, 12:24 PM   #73
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Does this DP will 2011 N55 335xi?
pee pee poo poo?
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      11-24-2010, 01:27 PM   #74
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^Er what?
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      11-24-2010, 04:19 PM   #75
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Does this DP will 2011 N55 335xi?
That fitment has not been confirmed.
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      11-24-2010, 06:18 PM   #76
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No problem. The AR design one just came out and that one fits N55 XI
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      12-04-2010, 12:26 PM   #77
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It should fit be the XI. I like this much better than the AR.
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      12-04-2010, 06:57 PM   #78
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Originally Posted by Matt@Camber-Toe View Post
Have you taken the N55 downpipe off yet? If so you will notice that the backside of the hot housing is nice and open much like a turbo on an N54...the stock downpipe crams down to a little over 2" across the inside...so you are telling me that it's not beneficial for a turbo to open up into the turbine housing, the neck back down at the v band to get out into the open expanse of the downpipe.

And why did mr. 5 gain hp using 3" dps over 2.5s?

I'm not trying to hijack anything, I deal with HP Autowerks all the time and Harold is one of the best people I've ever had the pleasure of talking to and doing business with. I can't knock the fitment of it or the gains of it (18hp is nice), the only thing I'm criticizing is the use of an oem size flange which from the factory is a bottleneck to begin with.
How can the Ar Design downpipe have a larger flange than the icarbon downpipe when they both have to be the same size where they mate up to the turbo? Forgive my ignorance, im just trying to understand. Can someone please explain this to me.

Also, all this talk about size, what are the actual diameters of each pipe?
From what i can understand they are the same, which is as follows:

Ar Design: 4" into 2 x 3". Then reduced to 2 x 2.25" to connect to midpipes
iCarbon: 4" into 2 x 3". Then reduced to 2 x 2.25" to connect to midpipes.

Is this correct? Could someone please clarify this.

Last edited by fly135; 12-05-2010 at 09:49 AM.
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      12-04-2010, 07:32 PM   #79
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Well, HP Autoweks says the fitment of the iCarbon has not been confirmed yet so how long should I wait until somebody confirm it?
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      02-27-2011, 10:38 PM   #80
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Any word on if the iCarbon fits N55 x-drive?
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