PE and N55 Mids Installed

MysticblueX3 · 12-18-2012, 08:49 PM

Just finished installing PE axle back and N55 mids on my N54. Took my friend and I 3.5 hrs. We had to make one run to the store for tools. Broke 2 star bits and stripped one star bolt. The four star bolts on the cross plate (over the mids) are a pita. I even hit it with some of that loosener stuff. Everything else, including the hangers were pretty easy. Finished just as the sun went down so no after pics yet. We had the car on jack stands. Not a lot of room but very doable for those thinking about DIY.

1ToBeOn2Wheels · 12-18-2012, 08:56 PM

Cool. Would love a sound clip. Where did you get the N55 mids and how much did you pay? Want to do this mod.

MysticblueX3 · 12-18-2012, 09:10 PM

I'll get a sound clip up tomorrow. I would rate stock at 2, current setup a 5 and my Ducati with aftermarket exhaust as 8 out of ten. Not much noise increase when cruising but when you get on the gas its really nice. Loud but not annoying loud. No cabin drone as others have said with the y pipe (no resonator). I Paid $600 for both n55 mids and PE axle back. Both used from this forum.

MysticblueX3 · 12-19-2012, 11:11 PM

Two questions:

1) The rubber hose that I pulled off the stock exhaust. I didn't see anyplace to plug in to the PE. So I just tucked it away under the heatshield. Is that what people did.

2) On both the PE and stock exhaust, there is a black rubber pipe about 3" in diameter and 2" long sticking out of the back of the exhaust. Nothing is connected to it. What does it do?

Mstandard · 12-19-2012, 11:55 PM

Thought you posted the soudclip

kleach18 · 12-20-2012, 01:22 AM

The rubber hose is the vacuum line for the stock exhaust valve. I just stuck a plug in it and zip ties it away.

The rubber pipe is the harmonic balance (called something like that). It is there to get rid of drone/vibration.

I installed mine about 1500 miles ago. It just keeps sounding better and better as I put more miles on it...

MysticblueX3 · 12-21-2012, 12:08 AM

Here are side by side pics. (Left) stock (Right) PE. Definitely planning to get a CF diffuser.

Video Clip #1. PE w/ N55 mids on N54. Cold start and idle.

Video Clip #2. 3k-6k revs with engine warmed up. Notice the "farting" sound after I let go of the gas. Is this common?

m7ammed · 12-21-2012, 12:31 AM

Quote:

Originally Posted by MysticblueX3

Video Clip #2. 3k-6k revs with engine warmed up. Notice the "farting" sound after I let go of the gas. Is this common?

Yes I think,

Have a lesson to mine

No downpipes for me, just PE

Mstandard · 12-21-2012, 01:25 AM

Quote:

Originally Posted by MysticblueX3

Here are side by side pics. (Left) stock (Right) PE. Definitely planning to get a CF diffuser...

Awesome sound, thank you

Cozy · 12-24-2012, 05:10 AM

Sounds great! Have you got any drive-by or launch videos?

The fart sound is normal, every PE does it, it's just exhaust gas resonating out of the tips when the revs drop. Something to do with vacuum or something, no idea but normal

.

Dackelone · 12-24-2012, 05:36 AM

Quote:

Originally Posted by MysticblueX3

Just finished installing PE axle back and N55 mids on my N54.

Thanks for posting!

Just one question... since you are running the N55 mid pipes... did you cut off the mid pipe resonator and install the PE y-pipe?

Btw... everyone says once you put a few thousand miles on the exhaust it sounds even better!

pixelblue · 12-24-2012, 06:27 AM

Quote:

Originally Posted by Dackelone

Thanks for posting!

Just one question... since you are running the N55 mid pipes... did you cut off the mid pipe resonator and install the PE y-pipe?

Btw... everyone says once you put a few thousand miles on the exhaust it sounds even better!

here's my exact setup with 27K on the clock. mid pipes have the resonator and recently put in. the sound definitely changes with time like a good wine

12-18-2012, 08:49 PM	#1
MysticblueX3 Second Lieutenant 36 Rep 245 Posts Drives: 135i Join Date: Aug 2012 Location: Seattle, WA iTrader: (0)	PE and N55 Mids Installed Just finished installing PE axle back and N55 mids on my N54. Took my friend and I 3.5 hrs. We had to make one run to the store for tools. Broke 2 star bits and stripped one star bolt. The four star bolts on the cross plate (over the mids) are a pita. I even hit it with some of that loosener stuff. Everything else, including the hangers were pretty easy. Finished just as the sun went down so no after pics yet. We had the car on jack stands. Not a lot of room but very doable for those thinking about DIY.
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12-18-2012, 09:10 PM	#3
MysticblueX3 Second Lieutenant 36 Rep 245 Posts Drives: 135i Join Date: Aug 2012 Location: Seattle, WA iTrader: (0)	I'll get a sound clip up tomorrow. I would rate stock at 2, current setup a 5 and my Ducati with aftermarket exhaust as 8 out of ten. Not much noise increase when cruising but when you get on the gas its really nice. Loud but not annoying loud. No cabin drone as others have said with the y pipe (no resonator). I Paid $600 for both n55 mids and PE axle back. Both used from this forum.
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12-19-2012, 11:11 PM	#4
MysticblueX3 Second Lieutenant 36 Rep 245 Posts Drives: 135i Join Date: Aug 2012 Location: Seattle, WA iTrader: (0)	Two questions: 1) The rubber hose that I pulled off the stock exhaust. I didn't see anyplace to plug in to the PE. So I just tucked it away under the heatshield. Is that what people did. 2) On both the PE and stock exhaust, there is a black rubber pipe about 3" in diameter and 2" long sticking out of the back of the exhaust. Nothing is connected to it. What does it do?
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12-19-2012, 11:55 PM	#5
Mstandard For Pony!!! 16 Rep 96 Posts Drives: 2015 328i xDrive Join Date: Oct 2011 Location: Québec \| CAN iTrader: (0)	Thought you posted the soudclip
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12-20-2012, 01:22 AM	#6
kleach18 Essayons 44 Rep 424 Posts Drives: 2013 135i Join Date: Aug 2012 Location: Dallas, Tx iTrader: (1)	The rubber hose is the vacuum line for the stock exhaust valve. I just stuck a plug in it and zip ties it away. The rubber pipe is the harmonic balance (called something like that). It is there to get rid of drone/vibration. I installed mine about 1500 miles ago. It just keeps sounding better and better as I put more miles on it... __________________ / 135i - M-Sport / 6-Speed / BMW Performance Exhaust / BMS Intake / JB4 Stage 2 ISO + Flex Fuel Wires / BMS 3.5in Down Pipe / CP-E Charge Pipe / Walbro 255 in-line fuel pump / BMS H8 AE / BMS SSK / APEX EC-7's with Nitto NT05's / COBB Tuning Sport Springs / Koni Yellows / Wagner Evo 1 / Blacklines / iCarbon Rear Diffuser / BMW Performance shift knob/boot / BMW Performance Steering Wheel /
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12-18-2012, 08:56 PM	#2
1ToBeOn2Wheels Freude am Fahren 31 Rep 703 Posts Drives: B9 Audi S5 Coupe Join Date: Oct 2007 Location: Sierra Nevada Foothills, California iTrader: (0)	Cool. Would love a sound clip. Where did you get the N55 mids and how much did you pay? Want to do this mod.
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12-21-2012, 12:08 AM	#7
MysticblueX3 Second Lieutenant 36 Rep 245 Posts Drives: 135i Join Date: Aug 2012 Location: Seattle, WA iTrader: (0)	Here are side by side pics. (Left) stock (Right) PE. Definitely planning to get a CF diffuser. Video Clip #1. PE w/ N55 mids on N54. Cold start and idle. Video Clip #2. 3k-6k revs with engine warmed up. Notice the "farting" sound after I let go of the gas. Is this common?
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12-24-2012, 05:10 AM	#10
Cozy Major 111 Rep 1,487 Posts Drives: E82 135i Join Date: Mar 2011 Location: Surrey, England iTrader: (0)	Sounds great! Have you got any drive-by or launch videos? The fart sound is normal, every PE does it, it's just exhaust gas resonating out of the tips when the revs drop. Something to do with vacuum or something, no idea but normal .
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