[elhigh]

Don't rake it at all. If you're going to do anything to the suspension then lower the entire car, front and rear. Don't go crazy with it but it does have a positive effect.

Plus raising the rear on a front drive car just makes you look like an idiot to the car guys. If you're like most guys willing to make ecomods to your car you're not too concerned with what other people think, but there it is.

Look at what some of the other guys here have done with lawn edging. It's crazy, and some of it looks really quite good - like store bought air dams. Keep in mind that you'll need to add some kind of bracing to keep it from folding back at speed, but not too rigid so it can give if it collides with something and absorb the shock.