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Thanks for the response. If it were driver mod for me personally, then we wouldn’t have an issue...this is my wife who does 10-15 days per year. She can’t seem to master it and yes, the break pedal does “sometimes”get a little deep. I run PF08s, so it is not a pad issue.
I track between 35-40 days a year in a Z4M, but I drive the 128 every now and then. It will keep pace with most stock E36 M3s, so it is not a slouch on the track.
I know about the 4-bolt flange on the 128, I’ve installed, uninstalled the diff about 3 times now. But I have not been under a 135 steptronic. Is the geared flange on the 135 removable/replaceable/swappable to the 128?
I’m not concerned about getting money back out if the 128, not planning to sell it. If they become the next thing in BMW club racing, then I’ll cage it and use whatever the rules allow me to use...but that’s a different time.
Will the diff fit, with work if needed, or not? I get the 3.73 is not numerically ideal for a turbo 135, but the tracks we run are never in 2nd, and 5th is a given on the front and back straight at VIR.
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