I won’t say the possibility is zero but I’ve never had one hit. I’ve even lowered the fairing with a drop bracket and never had it hit. As far as cost, it depends on what wheel you pick, lowered/stock height, which shocks you choose, paint, chrome or powder coat black, which tire, etc. I can give you a closer cost estimate with some more info.What is the cost of the fat tire upgrade on a 15? If you lower the front with the fat tire what’s the chances that the faring will hit the fender at full travel??