135i midpipe on 128i

BikeNHV · 12-22-2020, 02:58 PM

Hi All,

I'm sure this has been covered, but I couldn't find an exact answer by searching.

Car is a N51 128i
I have a 135i axle-back sitting around, not on the car.
Would a factory 135i midpipe bolt up on both ends? Or does the end that connects to the 128i header/cat need to be modified?

Driven5 · 12-22-2020, 11:53 PM

The flanges are not directly compatible. Cutting and welding is the easiest solution.

https://www.1addicts.com/forums/show....php?t=1735292

BikeNHV · 12-23-2020, 05:56 AM

Thank you! I could have sworn I saw that thread a few months ago, couldn't find it now.

12-22-2020, 02:58 PM	#1
BikeNHV Private First Class 131 Rep 185 Posts Drives: 128i, F-350, Cooper SE Join Date: Mar 2017 Location: CT iTrader: (1)	135i midpipe on 128i - modifications needed? Hi All, I'm sure this has been covered, but I couldn't find an exact answer by searching. Car is a N51 128i I have a 135i axle-back sitting around, not on the car. Would a factory 135i midpipe bolt up on both ends? Or does the end that connects to the 128i header/cat need to be modified?
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12-22-2020, 11:53 PM	#2
Driven5 Private 59 Rep 96 Posts Drives: E88 128i Sport/6MT Join Date: Jan 2020 Location: Seattle iTrader: (0)	The flanges are not directly compatible. Cutting and welding is the easiest solution. https://www.1addicts.com/forums/show....php?t=1735292
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12-23-2020, 05:56 AM	#3
BikeNHV Private First Class 131 Rep 185 Posts Drives: 128i, F-350, Cooper SE Join Date: Mar 2017 Location: CT iTrader: (1)	Thank you! I could have sworn I saw that thread a few months ago, couldn't find it now.
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