I was talking to a tuner today, and asked him about options. He said the 02's has built in intercoolers, so they typcially can take just a bit more than the previous years.

just wanted to get a run down on different years, as i just sold an 01 at work to a friend of mine, and he wants a tune as well.

 

All 99-02 trucks have a built in intercooler, it's the OBS trucks and vans that didn't have one.

As far as I know the only difference might be the IC has plastic tanks instead of being all aluminum. Otherwise, the 99-02 IC's should all be the same.