I have always been a Ford man but after doing my homework I decided on buying a Duramax. It is a bone stock 2009 extended cab LT 2500HD. I got deployed a couple of days after buying it but hope to get home at the first of October. I have been looking at what to upgrade but don't want to void the warranty. Maybe a air filter and muffler delete and flash chip. I just don't need to get to crazy. Any input would be appreciated and love the site.