Find out more about the BMW 1 Series E81, E82, E87, E88.
Manufactured from 2004 to 2013

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Post by MsportShaun1 »

Hi all.
Have any N54 auto 135i owners used the xHP gearbox flash?
I'm just trying to find out if its a good improvement and worth the money.
335i owners seem to rave about it from what I've read and I'm guessing it's the same auto box, ZF I think?
Maybe the 135i already has better gearbox software compared to the 335i, I haven't driven one to compare.
I'm quite happy with how it performs now but any improvements are always welcome.

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