Inadvertently bought 2 complete sets of these ramps (for a total of 8 ramps). Don't ask, just COVID delivery craziness. Nonetheless, I have a full set of 4 ramps remaining for sale, new in the boxes.
From my perspective, these are perfect for the M3. Light, easy to use, and just enough height to get any jack underneath. Slide them under all 4 wheels and drive up. There's a nice shallow well at the top so you know to stop. I'm pretty sure they added about 6 WHP as these are the race version and not just the sport or street version. Your results may very.
I've been using the set I kept for about 6 months and they work great. I used them for the X5 too, certainly strong enough.
Amazon has them for $50 a set, so I'm trying to make this easy and get them out of the garage. I'd take pictures but the product number seems to be B00UHLPES0 and they have plenty. $80 obo plus shipping or pickup