Call the dealer you bought it from, and speak with the Service Manager. A lot of the dealers will run through things with you for what can and cannot be modified within the realm of your warranty. Things like suspension, if you replace shocks, springs, swaybars and bushes then they wont warrant as they are obviously no longer Ford parts, other suspension parts that remain original will most likely be warranted. The best way to look at a warranty, is that its there for piece of mind if you want to just drive you car from A - B and not change a thing on it. If you choose to modify your vehicle then you pretty much accept all responsibilty for any breakages. Your changing your vehicle for your benefit, but outside the scope of the original packages 'ability' Best speak with the guys you bought it from. Just ask what you can and cannot do, dont tell them what you have already done, tell them that you would like to do what you have already done.