Csl Wheels

I look to the BMW M3 CSL rims and they say, not staggered offset. What is the real difference between them beside the price?

gauge wheels are wheels of different sizes and rims at the front and rear. Generally, this will be 3 or 4 inches wider at the rear (front 255mm to say, 285mm rear).
If you have an M3, you will get shifted, as the M3 is designed for the rims.
If you have an ordinary series 3, your car is probably not equipped with timing but you can buy spacers to the rear wheels for a staggered series fit (offset wheels give you more grip and stability, I recommend to go with them).

means "s the rear wheels are wider than the eye supposed to cool better manage

His other user / person Pro-term sales we do not fully understand. I think it means is staggered rear wheels are wider than the front.
Pretty sure the lag and everything that does not work well with the E23 or other type of wheels M3. But I think it depends on the year of the car wheels were intended. BMW likes to change around the wheel and everything shifts from year to year.