Midpipes - 3" single midpipe or double stock N55 with reso' delete?

katsooba · 12-12-2012, 11:20 AM

Hi guys!

im tinkering with the idea of making my own custom midpipe for the N55 engine and wanted you opinions about this

im facing two options

1. using the stock N55 midpipes and just canceling the resonator with a Y-PIPE.
2. making a new full 3" midpipe from downpipe to the rear muffler connector.

what should i expect with a 3" straight pipe?
do the double pipes on the original midpipe have any effect? its not that its a twin-turbo double seperated midpipe like in the N54,
in the N55 the downpipe already makes it a single pipe, why not continue it till the back?

my head is telling me going on the full 3" way

what you guys think?
if this will take place, i will post pics in the next month

addict · 12-12-2012, 11:25 AM

That idea has crossed my mind as well keep me posted on what route you take...Ill be deleting the resonater with a y-pipe see how it sounds with the custom w/magnaflow axleback I have.

135Pats · 12-12-2012, 11:31 AM

Just to be clear-DPs and muffler are stock? Removing resonators will add rasp and drone, how much will depend on the rest of your setup.

katsooba · 12-12-2012, 02:30 PM

DP and rear muffler gonna stay stock for now,
im only replacing midpipes,

as for drone and rasp, i have noticed that the BMW PE is canceling the midpipe resonator, i guess cant be so wrong about that.

my first step is doing the midpipe with one of the above choices, next will be the custom 3" pipe with rear muffler, and lastly will be DP.

cwg · 12-14-2012, 04:46 AM

I am pretty sure there was a thread with a vendor who was doing a single pipe exhaust about 8 or 9 months ago. If I can find it. I'll let you know. I think for a straight 6 the most efficient exhaust with the best scavenging is a single pipe. Not sure to what extent the turbo effects things

katsooba · 12-14-2012, 06:39 AM

the thing is that in the N55 there is a SINGLE downpipe that splits into TWO pipes.

why do this? maybe to use the old midpipe design?
one turbo, one downpipe, two midpipes one muffler.

why not make it all ONE from turbo - back

Freon · 12-14-2012, 10:35 AM

Could packaging of a single large pipe vs two smaller ones at that point under the car, and sound quality and loudness.

It wouldn't be an awful idea for an aftermarket turboback to be a single pipe. One larger pipe certainly weighs less than two smaller ones.

Dackelone · 12-14-2012, 11:08 AM

I vote for option #1. ...using the stock N55 midpipes and just canceling the resonator with a Y-PIPE.

katsooba · 12-14-2012, 01:45 PM

giving me a tough decision!
i guess ill have to try both over time

all a manner of money
firstly ill go with the 3" single midpipe
and while the pipes are out, i will take my time and making the double midpipe with a Y-pipe

addict · 12-14-2012, 09:34 PM

I had my resonator replaced with a magnaflow y-pipe today. I have a 5" cp-e downpipe and now from the shop did custom pipe from the y-pipe to a magnaflow muffler with my stock black tips. Sound is nice and deep no drone whatsoever and I had all the work done fairly cheap $100 including the cost of the y-pipe.

12-12-2012, 11:20 AM	#1
katsooba First Lieutenant 85 Rep 354 Posts Drives: bmw 135i Join Date: Apr 2012 Location: Israel iTrader: (0)	Midpipes - 3" single midpipe or double stock N55 with reso' delete? Hi guys! im tinkering with the idea of making my own custom midpipe for the N55 engine and wanted you opinions about this im facing two options 1. using the stock N55 midpipes and just canceling the resonator with a Y-PIPE. 2. making a new full 3" midpipe from downpipe to the rear muffler connector. what should i expect with a 3" straight pipe? do the double pipes on the original midpipe have any effect? its not that its a twin-turbo double seperated midpipe like in the N54, in the N55 the downpipe already makes it a single pipe, why not continue it till the back? my head is telling me going on the full 3" way what you guys think? if this will take place, i will post pics in the next month __________________ 135i N55 / KW V3 / MHD Flash / Tons of grip mods / CP-E charge pipe / CP-E 7" FMIC
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12-12-2012, 11:25 AM	#2
addict Second Lieutenant 150 Rep 278 Posts Drives: 2010 e90 335i Join Date: Sep 2012 Location: San Juan, Tx. iTrader: (0)	That idea has crossed my mind as well keep me posted on what route you take...Ill be deleting the resonater with a y-pipe see how it sounds with the custom w/magnaflow axleback I have.
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12-12-2012, 11:31 AM	#3
135Pats Major General 456 Rep 6,478 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	Just to be clear-DPs and muffler are stock? Removing resonators will add rasp and drone, how much will depend on the rest of your setup. __________________ E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP F30 N55 XDrive EBII
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12-12-2012, 02:30 PM	#4
katsooba First Lieutenant 85 Rep 354 Posts Drives: bmw 135i Join Date: Apr 2012 Location: Israel iTrader: (0)	DP and rear muffler gonna stay stock for now, im only replacing midpipes, as for drone and rasp, i have noticed that the BMW PE is canceling the midpipe resonator, i guess cant be so wrong about that. my first step is doing the midpipe with one of the above choices, next will be the custom 3" pipe with rear muffler, and lastly will be DP. __________________ 135i N55 / KW V3 / MHD Flash / Tons of grip mods / CP-E charge pipe / CP-E 7" FMIC
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12-14-2012, 04:46 AM	#5
cwg Captain 45 Rep 723 Posts Drives: 2017 M4 ZCP. AZB on black Join Date: Nov 2010 Location: Kailua, HI iTrader: (0)	I am pretty sure there was a thread with a vendor who was doing a single pipe exhaust about 8 or 9 months ago. If I can find it. I'll let you know. I think for a straight 6 the most efficient exhaust with the best scavenging is a single pipe. Not sure to what extent the turbo effects things
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12-14-2012, 06:39 AM	#6
katsooba First Lieutenant 85 Rep 354 Posts Drives: bmw 135i Join Date: Apr 2012 Location: Israel iTrader: (0)	the thing is that in the N55 there is a SINGLE downpipe that splits into TWO pipes. why do this? maybe to use the old midpipe design? one turbo, one downpipe, two midpipes one muffler. why not make it all ONE from turbo - back __________________ 135i N55 / KW V3 / MHD Flash / Tons of grip mods / CP-E charge pipe / CP-E 7" FMIC
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12-14-2012, 10:35 AM	#7
Freon Major 81 Rep 1,051 Posts Drives: 2009 135i Join Date: Nov 2007 Location: Indianapolis iTrader: (3)	Could packaging of a single large pipe vs two smaller ones at that point under the car, and sound quality and loudness. It wouldn't be an awful idea for an aftermarket turboback to be a single pipe. One larger pipe certainly weighs less than two smaller ones. __________________ 2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
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12-14-2012, 11:08 AM	#8
Dackelone European Editor 10528 Rep 22,992 Posts Drives: N54 e82 Join Date: Feb 2010 Location: Bayern, Germany iTrader: (1)	I vote for option #1. ...using the stock N55 midpipes and just canceling the resonator with a Y-PIPE. __________________ Dackel's European Delivery Museum Guide
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12-14-2012, 01:45 PM	#9
katsooba First Lieutenant 85 Rep 354 Posts Drives: bmw 135i Join Date: Apr 2012 Location: Israel iTrader: (0)	giving me a tough decision! i guess ill have to try both over time all a manner of money firstly ill go with the 3" single midpipe and while the pipes are out, i will take my time and making the double midpipe with a Y-pipe __________________ 135i N55 / KW V3 / MHD Flash / Tons of grip mods / CP-E charge pipe / CP-E 7" FMIC
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12-14-2012, 09:34 PM	#10
addict Second Lieutenant 150 Rep 278 Posts Drives: 2010 e90 335i Join Date: Sep 2012 Location: San Juan, Tx. iTrader: (0)	I had my resonator replaced with a magnaflow y-pipe today. I have a 5" cp-e downpipe and now from the shop did custom pipe from the y-pipe to a magnaflow muffler with my stock black tips. Sound is nice and deep no drone whatsoever and I had all the work done fairly cheap $100 including the cost of the y-pipe.
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