Looking to tune my truck for the first time. I have a buddy that works at a local diesel shop that said they could do it but I'm not to sure if I trust a little shop to handle this. Or do they just simply download premade tunes? Id like to switch the tunes with my edge cts insight. I guess my real question is are all tunes for stock trans/turbo custom or are they premade and I'm just paying to have them downloaded? I do live 20 minutes from merchant but woudlnt mind helping out my buddys shop if I'm just going to get the exact same tunes no matter were I go. Thanks in advance!