Ill have to dig up the catty letter from GM that I got a while ago...
But Ive noticed that my gas milage has decreased some, without
me getting into it more (I know the more you get into it the less
your gas milage)

Also, Ive noticed that in about 3rd gear or sometimes second, on
strong acceleration, there are a couple of points of hesitition.
It doesnt do it all the time though, just some of the time.

Whats the likleyness of my cat getting clogged? Ive got mods
will the dealership tell me my mods clogged my cat just so they
dont have to swap it for free?

 

Check to see if your boost is higher than normal, thats also a good sign.

 

Good point, thanks, I'll check when I go to work today.
I know theres a streach of road where im going 40mph
in 3rd gear at 2500 rpm and my normal map should be
about 15" of vacume. Ill see today if its more or less.