I'm buying a 04.5 duramax LLY need to know what to look for when I'm test driving it how it response is it good pull? He has efi live tuning on the fly 5 tunes for $500 for each tune the truck has 173000 lifted 6" with 35s" need to know what I should check or check for.alright the truck has sinister egr delete 4" diamond eye cat less and muffler delete ppe race fuel valve new injectors fass 150 lift pump upgraded cp3 dsp5 switch to change tune on the fly 5 efi live tunes largest tune on stage 5 is a plus 225hP tune do you think it's a good buy for 12800 needs cab corners and rockets.

 

I might be a bit scared buying a truck with that many "mods" a transmission that has been abused with that much HP might need a rebuild ($3000+) its your money but spend it wisely. good luck

 

Many LLYs where know for over heating so keep that in mind if it hasn't been addressed. In line with what BMax said, Personally I don't like purchasing any vehicle that has been modified by someone else.

The price seems good otherwise.