Worst to First in 5 Minutes: CP-E Axleback

BucksCty135i · 02-21-2012, 04:48 PM

Pictures and possibly video to follow... a local shop just installed my new cp-e axle back, with the black chrome tips and stealth pipe on my otherwise stock N55 with PPK. On the way home, with back seats down to carry my stock exhaust home, the cp-e is absolutely booming, completely intolerable! At this point, I'm trying to decide if I have it removed this afternoon, or wait a couple of days before putting it up for sale on 1Addicts.

I decided to at least get the other exhasut out of the car, put the seats back up and try again...

Completely transformed! No more booming, no drone, just a deeper tone, slightly more volume, more exhaust burble travelling all the way down the exhaust, and great sound and feel when the DCT makes a quick shift... a nice deep pop shooting down the exhaust.

Very happy so far. Will cold start in the morning and see how many neighbors I wake up.

BFD99 · 02-21-2012, 04:54 PM

Wow, crazy how such a difference can be had by just putting the seats back up!

jsmonet · 02-21-2012, 05:02 PM

so basically... screw a golf tee mod. just put down the rear seats.

RnmEvo9 · 02-21-2012, 05:09 PM

Quote:

Originally Posted by jsmonet

so basically... screw a golf tee mod. just put down the rear seats.

Or take them off completely and save yourself 50-60lbs.

BucksCty135i · 02-21-2012, 05:12 PM

I really didn't think the difference would be that pronouced, but when you think of all that leather, foam and framework, it really acts like a very large muffler. It was not pleasant.

FORCED AIR · 02-22-2012, 12:05 AM

Should get to sounding better after it has a few miles on it as well.

BMW86 · 02-22-2012, 12:24 AM

Exhausts always sound better when they're broken in. Give it some time and it will sound sensational.

GT1281 · 02-22-2012, 12:38 AM

If you don't mind me asking. How much did it run you? I'm looking at possibly changing my exhaust from the BMW Performance to the CP-E with the black tips. What difference does the stealth pipe make?

BucksCty135i · 02-22-2012, 07:17 AM

Quote:

Originally Posted by Phil335

If you don't mind me asking. How much did it run you? I'm looking at possibly changing my exhaust from the BMW Performance to the CP-E with the black tips. What difference does the stealth pipe make?

I paid full retail of $849, including the black tips, directly from CP-E, who had one in stock and ready to go. The stealth pipe is supposed to lessen / eliminate drone. It also supplies a third hanger to more securely attach the exhuast.

Harlequin · 02-22-2012, 07:35 AM

I went through the exact same thing when I got my Berk Race Exhaust installed. Driving home I was thinking "WTF have I done?"...

After I gor the OEM exhaust out of the car and put the seats back up I couldn't stop grinning

LMBe82 · 02-24-2012, 09:58 AM

How much of a difference in power do you feel the new exhaust made?

BucksCty135i · 02-24-2012, 10:04 AM

Quote:

Originally Posted by LMBe82

How much of a difference in power do you feel the new exhaust made?

Very hard to tell, as the exhaust note makes the car "feel" faster... probably picks up 5 HP or so, but really impossible to know without a dyno.

02-21-2012, 04:48 PM	#1
BucksCty135i Private 8 Rep 77 Posts Drives: 2012 LeMans Blue 135i M Sport Join Date: Nov 2011 Location: Bucks County, PA iTrader: (0)	Worst to First in 5 Minutes: CP-E Axleback Pictures and possibly video to follow... a local shop just installed my new cp-e axle back, with the black chrome tips and stealth pipe on my otherwise stock N55 with PPK. On the way home, with back seats down to carry my stock exhaust home, the cp-e is absolutely booming, completely intolerable! At this point, I'm trying to decide if I have it removed this afternoon, or wait a couple of days before putting it up for sale on 1Addicts. I decided to at least get the other exhasut out of the car, put the seats back up and try again... Completely transformed! No more booming, no drone, just a deeper tone, slightly more volume, more exhaust burble travelling all the way down the exhaust, and great sound and feel when the DCT makes a quick shift... a nice deep pop shooting down the exhaust. Very happy so far. Will cold start in the morning and see how many neighbors I wake up. __________________ 2012 135i M Sport, LeMans Blue/Black int with Poplar - PPK, Dinan Front Sway, BMWPedals, Active Autowerke Strut Brace, KM11 for winter and VMR 718for summer.
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02-21-2012, 04:54 PM	#2
BFD99 The Stig! 54 Rep 889 Posts Drives: 2008 135i 6MT Join Date: Sep 2011 Location: Tulsa, Ok iTrader: (1) Garage List 2008 BMW 135i [10.00]	Wow, crazy how such a difference can be had by just putting the seats back up! __________________ 2008 135i - FBO + JB4 15ohm + Water Meth
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02-21-2012, 05:02 PM	#3
jsmonet Captain 302 Rep 913 Posts Drives: 2020 x7 m50i Join Date: Nov 2011 Location: so cal iTrader: (2)	so basically... screw a golf tee mod. just put down the rear seats.
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02-21-2012, 05:12 PM	#5
BucksCty135i Private 8 Rep 77 Posts Drives: 2012 LeMans Blue 135i M Sport Join Date: Nov 2011 Location: Bucks County, PA iTrader: (0)	I really didn't think the difference would be that pronouced, but when you think of all that leather, foam and framework, it really acts like a very large muffler. It was not pleasant. __________________ 2012 135i M Sport, LeMans Blue/Black int with Poplar - PPK, Dinan Front Sway, BMWPedals, Active Autowerke Strut Brace, KM11 for winter and VMR 718for summer.
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02-22-2012, 12:05 AM	#6
FORCED AIR Got Boost? 7 Rep 234 Posts Drives: 2010 135i, Msport Join Date: May 2009 Location: The Desert iTrader: (1)	Should get to sounding better after it has a few miles on it as well. __________________ - - My Car Domain - - 2010 BMW 135i AT, AW, ///M Sport JB4\|BMS DCI\|MS 3" cattless DPs\|Golf Tee\|33% Tint\|///M Pedals
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02-22-2012, 12:24 AM	#7
BMW86 Major General 398 Rep 9,156 Posts Drives: RS3 Sedan / Macan S Join Date: Jul 2008 Location: Australia iTrader: (0)	Exhausts always sound better when they're broken in. Give it some time and it will sound sensational.
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02-22-2012, 12:38 AM	#8
GT1281 Major 63 Rep 1,375 Posts Drives: F30 330e/F25 X3 Join Date: Apr 2009 Location: USA iTrader: (6)	If you don't mind me asking. How much did it run you? I'm looking at possibly changing my exhaust from the BMW Performance to the CP-E with the black tips. What difference does the stealth pipe make?
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02-22-2012, 07:35 AM	#10
Harlequin Brigadier General 331 Rep 4,021 Posts Drives: F32 Coupé Join Date: Mar 2011 Location: Brisbane, Australia BMW Club QLD Member iTrader: (5) Garage List 2015 428i M-Sport [8.40] 2012 1M Coupé [9.25] 2011 135i M-Sport [9.14]	I went through the exact same thing when I got my Berk Race Exhaust installed. Driving home I was thinking "WTF have I done?"... After I gor the OEM exhaust out of the car and put the seats back up I couldn't stop grinning __________________
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02-24-2012, 09:58 AM	#11
LMBe82 Private First Class 19 Rep 122 Posts Drives: 2012 135i M sport Join Date: Feb 2012 Location: Ny iTrader: (0)	How much of a difference in power do you feel the new exhaust made?
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