I'm not worried about the DSP5 switch this is my first personal experience with this whole tuning thing I wasn't the one who placed the order for this tuner... my mechanic was hence why the email and other info is through him. so hes the one who ended up not orderin the switch. hes a ford guy he tuned hundreds of 6.0's my duramax is his first experience tunin a gm so I can see him makin the mistake of not getting the switch but switchin tunes isn't my problem anyway