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I agree - the performance increment from a stock 135i to 1M probably isn't worth the cost to upgrade. Certainly the benefit is even smaller if you have added a tune and maybe some suspension parts.
But if you don't already have a 135, it's an easy case to make that the 1M is worth the incremental price. The brakes, suspension, diff, body, slight tune ... no way you duplicate that for the price of 1M minus 135.
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