I just read a review of this guy that had shorty headers on his tahoe and then installed the dynatech longtubes with highflow catalitic converters, and he says the difference is noticeable. I currently have the jba ceramic shortys on mine and Im looking for more power, since i dont want to spend 7 grand in a supercharger, i thought this may be the way to go, but will there be much difference to be woth it? does anyone has experience with this? hp numbers perhaps?