These are made of 16ga anodized aluminum so they are easy to clean and can be painted to match your car. I suggest installing with silicone so they stay smooth and allow the body to flex behind them. You only need to remove your hood, wiper motor, wire gutter and any accessories you've attached to the firewall and it'll just slide into place. No need to remove your engine or even your distributor. Can be easily drilled for A/C fittings or wiring.