I don't know about "slammed", but my old E30 was pretty low. It drug most speed bumps before the m50 swap and I had trashed 2 pans already. I did it to thicken the front and bottom for those times you drag over speed bumps. I would have done the sides too if I wanted to go for total strength. Point is the thicker the metal the stronger it is, period. And welding an oil pan is common and happens all the time. If you are running stock you should be ok, but I would be careful I hope they are a good quality TC Kline or Ground Control set.