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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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      11-16-2010, 12:00 AM   #1
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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.
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Last edited by HP Autosport; 11-22-2010 at 09:10 PM.
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      11-16-2010, 12:08 AM   #2
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Nice to finally see an n55 downpipe! Great gains too. Any issue with catless codes? Or did you need to use a dp fix of some sort?
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      11-16-2010, 12:16 AM   #3
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NIce! Can't wait to see the gains with a tune!
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      11-16-2010, 12:26 AM   #4
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      11-16-2010, 12:36 AM   #5
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that's pretty..
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      11-16-2010, 12:37 AM   #6
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Specs? 3" 4"?
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      11-16-2010, 07:21 AM   #7
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Congrats Icarbon and HP, looks like you guys were first... Can't wait to see gains with a tune, if only now somebody could make a solid intake.
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      11-16-2010, 07:50 AM   #8
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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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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, 09:45 AM   #10
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Quote:
Originally Posted by shockin330i View Post
Specs? 3" 4"?
I'd like to know this too.
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      11-16-2010, 09:51 AM   #11
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Very nice downpipe. I guess iCarbon beat everyone to the punch. Good work.
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      11-16-2010, 10:10 AM   #12
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does this dp fit the n55 335i coupe?
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      11-16-2010, 10:25 AM   #13
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Quote:
Originally Posted by jjurroz View Post
does this dp fit the n55 335i coupe?
+1
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      11-16-2010, 10:31 AM   #14
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Quote:
Originally Posted by madmanhiker View Post
+1
It should since the 135i and 335i share the same OEM downpipe.
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      11-16-2010, 10:40 AM   #15
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Quote:
Originally Posted by DTMrack.com View Post
It should since the 135i and 335i share the same OEM downpipe.
is what I suspected but I needed confirmation. I didn't want to put an order in and then not have it fit
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      11-16-2010, 10:50 AM   #16
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Quote:
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is what I suspected but I needed confirmation. I didn't want to put an order in and then not have it fit
Perfectly understandable.
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      11-16-2010, 11:19 AM   #17
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Quote:
Originally Posted by shockin330i View Post
Specs? 3" 4"?
Piping diameter goes from 101mm (4") to 76mm (3") and the DP has 1.5mm walls.

Quote:
Originally Posted by jjurroz View Post
does this dp fit the n55 335i coupe?
Yes.

Quote:
Originally Posted by tscdennab View Post
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...
R&D takes time. Anyone can release a DP for the 1 and 3-series with the N55 engine in 3 days but may not fit correctly or have quality issues.

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 Autosport; 11-16-2010 at 11:35 AM.
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      11-16-2010, 11:21 AM   #18
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Quote:
Originally Posted by HP Autowerks View Post
Yes.
what's the diameter of the piping?


Regards,
Jose
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      11-16-2010, 11:24 AM   #19
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Looks like things are shaping up quite nicely for the N55 guys. Maybe they won't be so handicapped on power after all...
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      11-16-2010, 12:14 PM   #20
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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, 12:53 PM   #21
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any videos available for sound?
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      11-16-2010, 12:57 PM   #22
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Quote:
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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.
How can you make it any bigger than what it's connected to - you've got to match the size at some point?
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