Originally Posted by crozetian
Doesn't the 335is have additional oil and radiator cooling not found on the standard 335? I've seen no reference to those on the 1M, although you'd think they would be there since BMW seems to expect many 1M's to see track time.
The 335is has additional oil cooler, but the 135i comes with the auxiliary oil cooler standard, basically putting it on par mechanically speaking with the 335is. It just doesn't have overboost.
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