The high-revving E92 M3's V8 is good for many things. Putting one under the hood of a 135i, though, might just be the best thing you can do with the old S65 engine.
There were around 1,400 examples of the BMW e46 M3 CSL built, and by all accounts they were exceptionally well received. However, according to Ludwig Willisch, the boss of the automaker's M division, the current e92 M3 won't get the same treatment. He – or perhaps the accountants – feel that "based on current numbers, there is most likely insufficient demand for the M3 CSL."