Originally Posted by SPC LV
I could be wrong but I'm pretty sure the 1 series is based on the e46 platform/chassis.
Understandable why people would think the 1-series is based off the E46 chassis since it was introduced right smack in the middle of the E46 life cycle back in 2003. However, it is incorrect. The 1-series has its own unique chassis separate from the E46.