ever since i have had my truck the only thing i have done is a true dual exhaust setup with hi-flo cats and it has always been faster than other stock trucks, programmed trucks, and even some tuned trucks. so i had one of my friends hook up his hp tuners software to my truck to try and figure out if there is anything done to my truck since i bought the truck used. he thinks that there is a programmer on my truck but i have had both a bullydog and a superchips programmer on there and they hooked up with no problem and my shift points are not raised at all. is there anyway of knowing if my truck has some mods i dont kno ab?

btw i drive an 02 gmc sierra rcsb with a 5.3

 

some trucks are just like that, just be glad you have one.

 

Yep, they're called freaks...you're one of the lucky ones!

 

Woody its tuned ha

 

Also you can put 2 programmers on your truck i have done it i had the bullydog and the superchips flash pack on my truck. But when i took them off my truck it didnt rite till about 100miles.

 

thats what i have been thinkin all along but i wasnt for sure

 

there's no point in "stacking" programmers on a gas engine

 

You can tell if it "programmed" if you download a stock tune from the bin respository and compare it your tune on the the truck. Things to look for are the VE table, spark, etc...

 

i didnt mean for ya to think i "stacked" both of 'em on my truck. What i was trying to say was that those programmers on at different times just to see which one worked better

 

does gm vary the tuning on their trucks. like some trucks come stock with more timing, more corrected air fuel ratio, and air intake tables? or is it the same for all trucks?