I will be adding a K&N air filter and a magna flow cat back exhaust....does the computer need to be remapped?

 

Nope

 

Those mods on a 2.2 shouldn't cause any issues. But. If it does throw a CEL,then you might be looking at a reflash or possible tune.
Do not over oil the K&N filter. They have been known to mess up some Maf sensors.

 

X 2

Check the K&N filter for "over oiling" right out of the box, if it seems excessively oily, just blot it with some paper towels.

Make sure the intake kit you pick has some distance between the filter and the adapter where you re-mount the factory MAF, you should have about 8" minimum to avoid contamination by any oil mist from the filter.

 

I agree with both 843 and Solman your computer should relearn you air intake and your exhaust flow fairly quickly. you may want to reset your ecm after you install both systems