N55 catback

Pepe_pr · 04-10-2011, 08:58 AM

Hi guys, im really debating if to install a catback exhaust on the n55. The reason is that i like the sound on the dp and stock exhaust and second im really not sure if an actual catback will actually produce hp? The oem catback of the n55 has no restriction rather than a small crimped section near the muffler thats all (my idea). Anyone thinks different.

Any dyno proven gains ? Any thougths......

D335NUTZ · 04-10-2011, 09:57 AM

Get DPs and cut the secondary cats and call it a day then?

Juiced46 · 04-10-2011, 10:29 AM

Quote:

Originally Posted by Wilazn

Get DPs and cut the secondary cats and call it a day then?

He already has a DP and the N55 doesnt have the secondary cats unless you have an X Drive

Pepe, the sound will change for sure since you will be going to be using a different style muffler, that probably flows much better then stock and slightly larger piping. As far as power, on my car there was a noticeable difference when I took off the catback after doing the DP and putting the stock catback on. However my car has the secondary cats.

Pepe_pr · 04-10-2011, 01:54 PM

Quote:

Originally Posted by Juiced46

He already has a DP and the N55 doesnt have the secondary cats unless you have an X Drive

Pepe, the sound will change for sure since you will be going to be using a different style muffler, that probably flows much better then stock and slightly larger piping. As far as power, on my car there was a noticeable difference when I took off the catback after doing the DP and putting the stock catback on. However my car has the secondary cats.

i know that in the cars that have secondary cats it gives them a few whp, but i since i have no secondary cats i cant think other that other than 3-5 whp gain if any.. does not justify the 1500.00 expense.

dont get me wrong, Im not been cheap it just been realistic.

CPWINCH · 04-10-2011, 03:09 PM

i have exhaust on mine and i feel it noticeably faster, even if it only added very little horsepower theyre lighter too

henry418 · 04-10-2011, 05:58 PM

Quote:

Originally Posted by Juiced46

He already has a DP and the N55 doesnt have the secondary cats unless you have an X Drive

Pepe, the sound will change for sure since you will be going to be using a different style muffler, that probably flows much better then stock and slightly larger piping. As far as power, on my car there was a noticeable difference when I took off the catback after doing the DP and putting the stock catback on. However my car has the secondary cats.

So my 2011 e92 335xi m-sport has secondary cats? I'm verifying because I'd love to have a bit louder exhaust note without spending 1000+ on exhaust

Juiced46 · 04-10-2011, 06:39 PM

Quote:

Originally Posted by henry418

So my 2011 e92 335xi m-sport has secondary cats? I'm verifying because I'd love to have a bit louder exhaust note without spending 1000+ on exhaust

You got it. X drive has it, non X drive doesnt.

This is off my 2011 X drive

MikeDNJBMW · 04-10-2011, 11:12 PM

i took off my secondaries 2 weeks after i bought the car(11 e90 x drive) and omfg huge difference, it was choking on top end and sounded weak...you wont regret it dude, get it done! local shop should charge less than $100

FrankiE90 · 04-10-2011, 11:29 PM

Pepe think of weight saving when getting an exhaust. The oem one is heavy. If ur at that stage then do it.

henry418 · 04-10-2011, 11:55 PM

Quote:

Originally Posted by Juiced46

You got it. X drive has it, non X drive doesnt.

This is off my 2011 X drive

Quote:

Originally Posted by njlakeshoreg

i took off my secondaries 2 weeks after i bought the car(11 e90 x drive) and omfg huge difference, it was choking on top end and sounded weak...you wont regret it dude, get it done! local shop should charge less than $100

I wonder why only x-drives get the secondary cats... Thanks for the info and yes I'll definitely consider it! May help even more if you post a video

But wait, I guess it would just sound like a 2011 335i non x-drive since they don't have the cat lol.. I watched videos of them and they basically sound the same as my car..

ian2002525 · 04-11-2011, 03:36 AM

i have eissenmann catback exhaust; noticed the rpm raises up/down faster!

MikeDNJBMW · 04-11-2011, 09:29 PM

LoL @ Henry, ya i was doing the same thing at the time lol...............

RyanMv4 · 04-11-2011, 10:22 PM

Quote:

Originally Posted by njlakeshoreg

i took off my secondaries 2 weeks after i bought the car(11 e90 x drive) and omfg huge difference, it was choking on top end and sounded weak...you wont regret it dude, get it done! local shop should charge less than $100

I was going to do this also but didn't think it would make much sound difference but it i guess it does !

04-10-2011, 08:58 AM	#1
Pepe_pr Lieutenant 36 Rep 553 Posts Drives: 135i black on black Join Date: Sep 2010 Location: San Juan PR iTrader: (1)	N55 catback Hi guys, im really debating if to install a catback exhaust on the n55. The reason is that i like the sound on the dp and stock exhaust and second im really not sure if an actual catback will actually produce hp? The oem catback of the n55 has no restriction rather than a small crimped section near the muffler thats all (my idea). Anyone thinks different. Any dyno proven gains ? Any thougths...... __________________ 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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04-10-2011, 09:57 AM	#2
D335NUTZ The Blue Beast 143 Rep 5,665 Posts Drives: 2008 E92 335xi in Montego Blue Join Date: Jan 2011 Location: Queens, New York iTrader: (8)	Get DPs and cut the secondary cats and call it a day then? __________________ Cobb AP Stage 2+ \| BMS DCI \| UR Catless DP \| UR Chargepipe \| Tial BV 50mm \| BSH OCC \| ETS FMIC \| Eisenmann Race Exhaust \| KWv1 Coilovers \| Volk TE37 TC Kline Ed.
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04-10-2011, 03:09 PM	#5
CPWINCH Brigadier General 741 Rep 4,635 Posts Drives: Toyota Prius Join Date: May 2010 Location: Los Angeles iTrader: (7)	i have exhaust on mine and i feel it noticeably faster, even if it only added very little horsepower theyre lighter too __________________ Follow my BMW instagram @CARMODIFICATION Let me know you are from bimmerpost and i'll follow back
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04-10-2011, 11:12 PM	#8
MikeDNJBMW Lieutenant 17 Rep 420 Posts Drives: 2011 e90 335 ix, 08 335i e92 6 Join Date: Sep 2010 Location: bergen county, nj iTrader: (6) Garage List 2012 bmw x5d [0.00]	i took off my secondaries 2 weeks after i bought the car(11 e90 x drive) and omfg huge difference, it was choking on top end and sounded weak...you wont regret it dude, get it done! local shop should charge less than $100
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04-10-2011, 11:29 PM	#9
FrankiE90 Major General 670 Rep 8,800 Posts Drives: Krooked Sk8board Join Date: Feb 2008 Location: Pasadena, Ca iTrader: (11)	Pepe think of weight saving when getting an exhaust. The oem one is heavy. If ur at that stage then do it. __________________ FrankiE90 AKA:.[The TANK] *CLICK THE SIG E90s (been gone but not forgotten) • KW clubsports • • • • • • • • • • 18" BBS GT4 // Build E30 (pending) + E46 M3 Wagon ESTORIL Blue
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04-11-2011, 03:36 AM	#11
ian2002525 台灣台北市 89 Rep 1,267 Posts Drives: 2009 GT-R Premium Join Date: Jun 2010 Location: Brentwood, TN/台灣 iTrader: (6) Garage List 2011 335i coupe [9.00]	i have eissenmann catback exhaust; noticed the rpm raises up/down faster!
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04-11-2011, 09:29 PM	#12
MikeDNJBMW Lieutenant 17 Rep 420 Posts Drives: 2011 e90 335 ix, 08 335i e92 6 Join Date: Sep 2010 Location: bergen county, nj iTrader: (6) Garage List 2012 bmw x5d [0.00]	LoL @ Henry, ya i was doing the same thing at the time lol...............
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