Originally Posted by F335i
Get the best tune to your liking, if you need to use the warranty just take it off and that's it.
Why does everyone say if you get a tune you lose your warranty? You just need to find a mod friendly service department. I usually bring my car in and turn the jb to stock. One time I forgot and called my service adviser and he did it for me. I had a noise coming from under the car and he had them check and apparantely when I had my downpipe installed the installer didn't tighten some screws and they took the liberty of tightening them for me at BMW. it is all about a mod friendly dealership.