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BMW's UK website lists the 130i with M Sport package at 3190 lbs (1450 kg). If you compare the weight of the 335i Coupe (with the N54 turbo engine) to the weight of the 328i Coupe (with the N52 n/a engine), there is a 220 lb difference. Some of that is no doubt the turbos themselves, but there is also weight in the intercooling and requisite plumbing. There may also be some minor equipment differences contributing to the weight. Either way, if you assume a roughly 200-lb difference between turb and non-turbo versions, that would put the 135i at about 3400 pounds with M Sport package, which it will no doubt have. There may be some weight savings with a conventional coupe versus a hatch, but remeber the coupe also has a longer overhang. Any weight advantage would be minimal, perhaps less than 50 pounds.
So let's assume the 135i Coupe comes in at 3350 pounds. At 300 horsepower, that works out to .090 (.08955224) hp/lb. Slightly better than the Mustang GT, not quite as sharp as the 350Z. Nevertheless, it will still be a fast car. And it should still be roughly 300 pounds lighter than a 3 Series coupe.
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