It can be a simple problem or a huge problem. You need to put it on a lift it and inspect the whole bottom half of the car. You could had damage more then just the bottom half of the engine cover.
2007 IS350 MODS: F sport intake, Custom 2.5 inch true dual to Borla mufflers. On Michelin PSS. 13.6 @ 101mph 1/4 mile with full interior.