If I went from the stock 3.3" pulley to a 3 inch pulley, would I have to change the belt or retune and what differences would I see?

 

Belt might need to be changed... You may or may not have slip.

You will be hurting things if you just switched pulleys. You need to buy larger injectors as well... and with larger injectors you HAVE to get a tune...

Do it safe.

 

smaller pulley=more air
more air=more fuel
more fuel=larger injectors
larger injectors=Tune

 

^^ Yeap.

 

THANKS GUYS!!!! ") I didn't realize that even just a little change in the pulley size had a bigger effect on performance than I thought!

 

Yea.. they are really pushing the stock injectors to the limit...