Originally Posted by LordAccord

In my experience, if it's enough of an incline, or a high enough speed bump, you are going to hit your front lip anyways. The reason you want to hit bumps and slants at an angle is to avoid the lower parts of your car (underneath) from hitting. This includes, but is not limited to: tow hooks, plastic protective sheet, lca's, oil pans, cat/headers, mounts.

The principle of it is that if you hit at an angle, you can go over a bump with about half of the front of your car, where as, if you go over it straight, you only go over it with about 1/4-1/3 of the front of your car (wherever your wheels stop). Hitting it at an angle ensures that while the first wheel is going over / up, your lowest parts are off the ground, and while your second wheel is going over/up, your lowest parts are off the ground.

Basically, you are extending the distance and amount of time that the lower parts of your car are high enough off the ground to prevent scraping. (and as a sidenote, it's also easier to control how fast you set the car down... if both wheels land at the same time, you have more suspension travel and more possibility of something hitting). It's why it's still not even avoidable on very wide speed bumps, very sharp angles, etc, even if you hit them sideways. lol :-)