I'm looking for a straight answer on modifications and how it affects the waranty. I would like to perosnalize the car somewhat within reaoson but don't want to loose my waranty. Really the car "needs" nothiing but a spring change will close the gap in the wheel well and look and perform aggressive. The stock 17's I want to use for winter use with a winter tire and go with a 17" x 7" Tenzo summmer rim/tire combo, the RS's will work for now. As for the engine a turbo would be a great project as well. Is all this possible wihout voiding the waranty or are my only optons a Mazda 3 forums sticker added to the passenger windows? I have not talked to Mazda directly or the service department yet, maybe that is my best option..any thoughts?