I'd like to add some things to my car, but with only 3,800 miles on it I really don't want to void my warranty yet. I've added a few things and have been looking at changing out the stock plugs for better ones, but I thought I would get some advice from the more experienced upgraders. I've done some searches and read through some of the threads, but haven't found too much stuff that will not kill the warranty. I know there is going to be only so much stuff I can do to it to keep from voiding it, but if there is something I can do I'd be interested. Thx for any info.