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BMW 3-Series (E90 E92) Forum
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iCarbon N55 Downpipe Review
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| 11-16-2010, 12:00 AM | #1 |
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BimmerPost Supporting Vendor
 
Drives: 2011 135i DCT & 2011 1M Join Date: Mar 2007
Location: Santa Barbara, AST, Brembo, Eibach, H&R, GIAC, Koni, Quaife, Stoptech, Vorshlag,
Posts: 10,050
iTrader: (26)
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iCarbon N55 Downpipe Review
When iCarbon contacted us about trying their new N55 downpipe we were excited to see just what they had cooked up. Our N54 powered 335i responded so well to a free flowing downpipe that we have been itching to see what kind of performance could be gained on our new 135i. The results were shocking to say the least.
 We gained power EVERYWHERE! A quick look at the dyno results will confirm this. There were literally no sacrifices, no shifting of the power curve left or right, this downpipe just took the stock dyno lines and increased power everywhere along them.  This mod is definitely noticeable by the seat of the pants. After we installed the pipe we drove to the dyno and the whole way there car just felt way better. It was hard to believe that the downpipe alone was responsible for the significant increase in power plus it added a nice growl to the exhaust note. Nothing outrageous or look at me loud, just that nice sporty exhaust note that all BMW’s should come with and it sounded even better with the quick shifting DCT. Keep in mind that we completely reverted our car back to stock. We gained at least 17 hp and 16 ft/lb at the largest separation of the graph.  In conjunction with our N55 High Flow Filter, a Berk Technology exhaust and a tune, there is some serious gains to be made. These engines love to breathe freely as is evident by iCarbon’s well thought out downpipe and our comparisons with our filters and Berk’s systems. The HP to dollar ratio is great with this modification and is an integral part of creating a great performing car. *** This DP Fits both 135 and 335i with the N55 egine Here are some pictures from our install. You can tell just by looking at the side by side comparison how much more the iCarbon downpipe is set up to free flow.          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. Last edited by HP Autowerks; 11-22-2010 at 09:10 PM. |
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| 11-16-2010, 07:50 AM | #8 |
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Banned
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I always wondered why was it so hard to come out with a downpipe 3 days after the N55-based 135i/335i launch
 Glad to see someone finally releasing a downpipe !BUT, your graph is misleading, unfortunately. The Y axis starts from 150 which increases the gap between the before/after graphs. I would say there is no need to exaggerate with the marketing... |
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| 11-16-2010, 08:52 AM | #9 |
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The Coding Guy
Drives: FBO 335i Vert meth/nitrous Join Date: Jun 2007
Location: Brooklyn, New York
Posts: 17,872
iTrader: (5)
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Wow this is really nice...congrats to you guys and the N55 owners...You guys have something to start power ups with...Very nice..
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| 11-16-2010, 10:25 AM | #13 | |
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Major
 
Drives: '11 E92 335i Join Date: Jul 2008
Location: Jacksonville, Fl
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| 11-16-2010, 10:40 AM | #15 | |
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Second Lieutenant
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| 11-16-2010, 11:19 AM | #17 | |||
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BimmerPost Supporting Vendor
Drives: 2011 135i DCT & 2011 1M Join Date: Mar 2007
Location: Santa Barbara, AST, Brembo, Eibach, H&R, GIAC, Koni, Quaife, Stoptech, Vorshlag,
Posts: 10,050
iTrader: (26)
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Why are you looking at the gaps anyway, that doesn't tell you much. The gains is what you should be after. If ift were for pure marketing we would have used a Dynojet to show even higher numbers. Last edited by HP Autowerks; 11-16-2010 at 11:35 AM. |
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| 11-16-2010, 12:14 PM | #20 |
Drives: E28 535, 1996 Dodge Ram Diesel Join Date: Mar 2007
Location: Valley Stream, NY
Posts: 15,742
iTrader: (7)
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the biggest thing is where it connects to the exhaust. that big of a pipe will not clear the cross bracket on an xi model...its identical to the AR pipe.
It looks good, but i would increase the opening on the turbine outlet flange. Its the same size as stock and that is one source of the problem.
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| 11-16-2010, 12:57 PM | #22 | |
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Brigadier General
 
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