my truck is an 06 2500 quad cab auto. as far as i know it all stock. I ran straight pipe from turbo back and put a cold air intake on. i notice after i did that it will not blow a puff of smoke. How come? is it because i am sucking more air ? Thanks

 

you should have more power
thus more air it is running leaner and not so rich, otherwise using all of the fuel
thus no smoke
you may be running a higher temp, and not sure what you mean by straight pipe to the turbo, they all curve

 

basically yes your truck is running clean. You dont get any smoke when you floor it ? my '05 would puff some smoke with just a straight pipe exhaust and a CAI.

lol, he meant no cat or muffler