Yeah, you can definitely run a 135i axle back on the 128i. I've run both the N54 135i stock axleback and now running a Dinan 135i axleback.
The N54 was a subtle improvement in sound, N55 version is supposed to be slightly more aggressive. The Dinan is a well controlled louder, and I really enjoy it.
The inlet tube side on the 135i is slightly larger than the 128i. I was able to use an exhaust band clamp and slip the 128 pipe inside the 135's and then tighten it up.
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11 128i slicktop
13 WK2
19 Alltrack S
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