A 135 HP tune all the time even when towing. I dont change it in the winter either. I guess I should rig up a DSP5 switch this winter for my EFI and actually use the features I bought it for in the first place.
Not a bad idea to swap out the tune...it'd be a whole lot easier if EFI got that promised feature of having multiple tunes on a flash card. I've got a killer smoke tune that has wicked power I could try as a daily driver tune :)
Our cats literally just have a screen mesh in them...which is a joke if you ask me.
When I had my 6.5 I took the cat off because I thought it'd help reduce EGTs, it really didnt change that I could tell.
My 6.5 TD was a dump-truck.
On my unit, when facing the bobcat (entering it) there is an electronic brain to the left of the seat, and there are 5 lights.
One for each safety function.
I dont have a good photo of it online anywhere.
Mine is a 1999 model.
Did you try energizing the starter directly from the battery...